Algebra Module 3-4: Relations & Functions
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Questions and Answers

What is the slope of the line passing through points (-2, 4) and (4, 1)?

  • -2/3
  • 2/5
  • -1/2 (correct)
  • 3/2
  • A line passes through the points (5, 6) and (5, -2). What is the slope of this line?

  • 8
  • undefined (correct)
  • -2/5
  • 0
  • What is the slope of the line that passes through the points (-3, 2) and (7, 2)?

  • 1
  • undefined
  • 2/5
  • 0 (correct)
  • The equation of a line on a graph has a slope of 1/2 and crosses the y-axis at 3. Which of the following is the equation of this line?

    <p>$y = (1/2)x + 3$ (B)</p> Signup and view all the answers

    A line has a slope of 1/2 and passes through the points (4, 6) and (m, -2). What is the value of m?

    <p>-12 (A)</p> Signup and view all the answers

    A line has a slope of -5/4 and passes through the points (3, 7) and (p, -4). What is the value of p?

    <p>11/4 (C)</p> Signup and view all the answers

    Which equation below represents a line with a slope of 3, passing through the point (2, 5)?

    <p>$y - 5 = 3(x - 2)$ (A)</p> Signup and view all the answers

    Which of these is the point-slope form of a line with a slope of -2, passing through the point (-1, 4)?

    <p>$y - 4 = -2(x + 1)$ (A)</p> Signup and view all the answers

    Given the function f(x) representing the number of people at a tourist destination over time, what is the value of f(4)?

    <p>5 (D)</p> Signup and view all the answers

    Which transformations are applied to the parent function f(x) = |x| to obtain the function h(x) = -3|x - 4| + 5? (Select all that apply)

    <p>Translated up 5 units (A), Reflection over the x-axis (B), Vertical stretch by a factor of 3 (C), Translated right 4 units (E)</p> Signup and view all the answers

    If $f(x) = 3x + 2$ and $h(x) = x^2 - 1$, what is the value of $4[f(-2) + h(3)]$?

    <p>16 (C)</p> Signup and view all the answers

    Given the function $f(x) = -2x + 3$, what is $f(3) - f(4)$?

    <p>2 (B)</p> Signup and view all the answers

    Given a function, find the range if the domain is ${-2, 1, 3}$ where the function is defined by the following mappings: -2 maps to 3, 1 to 5 and 3 to 5. (Select the elements in the range)

    <p>{3, 5} (D)</p> Signup and view all the answers

    What is the result of $f(-1)$ when the function is defined by $f(x) = 3x^2 + 2$?

    <p>5 (B)</p> Signup and view all the answers

    If $g(x) = |x - 2| + 1$, what is the smallest possible value for $g(x)$?

    <p>1 (A)</p> Signup and view all the answers

    For $j(x) = rac{1}{2}x - 3$, what is $j(6) - j(2)$?

    <p>2 (C)</p> Signup and view all the answers

    Given the function $f(x) = x^3 + x^2 - 5$, what is the value of $f(2)$?

    <p>{7} (C)</p> Signup and view all the answers

    A function f(x) represents the distance from a house to a café over time. If you are given a graph of f(x), what does f(7.5) represent?

    <p>The distance at time 7.5. (C)</p> Signup and view all the answers

    How does the graph of $k(x) = 2|-x + 3| - 4$ transform the parent function?

    <p>Reflected over the y-axis, translated 4 units down, vertically stretched by a factor of 2 and translated 3 units to the left. (A)</p> Signup and view all the answers

    What is the equation for the nth term of the arithmetic sequence 10, 8, 6, 4, ...?

    <p>$a_n = 12 - 2n$ (A)</p> Signup and view all the answers

    Consider the function $k(x) = 2|-x + 3| - 4$ Identify all correct statements.

    <p>The graph is translated down 4 units and reflected over the y-axis. (A)</p> Signup and view all the answers

    What is the 10th term in the arithmetic sequence 10, 8, 6, 4, …?

    <p>-8 (D)</p> Signup and view all the answers

    Which equation represents the line passing through the point (-2, 3) with a slope of $\frac{3}{2}$?

    <p>$y - 3 = \frac{3}{2}(x + 2)$ (C)</p> Signup and view all the answers

    When the equation $y - 3 = 4(x + 2)$ is written in standard form $Ax + By = C$, what are the values of A, B, and C?

    <p>A = 4, B = -1, C = 11 (A)</p> Signup and view all the answers

    Using the points (2007, 67.11) and (2016, 92.98), where x is the number of years since 2006, what is the equation of the line of fit in slope-intercept form?

    <p>y = 2.87x + 64.24 (A)</p> Signup and view all the answers

    Based on the trend line calculated using points (2007, 67.11) and (2016, 92.98), what is the predicted price of a ticket in 2030?

    <p>$131.63 (A)</p> Signup and view all the answers

    Solve the inequality $-2y > 10$

    <p>$y &lt; -5$ (C)</p> Signup and view all the answers

    Which of the following inequalities has no solution?

    <p>$4y + 3 \leq 2(2y - 2)$ (B)</p> Signup and view all the answers

    Solve and graph the inequality $y - 3 > 1$.

    <p>y &gt; 4 (B)</p> Signup and view all the answers

    Which equation correctly represents a line with a slope of -3/4 and passes through the point (0, -7)?

    <p>$y + 7 = -\frac{3}{4}(x + 0)$ (D)</p> Signup and view all the answers

    Sophia sells 3 pancakes and a coffee for $7.50. She also sells 1 pancake and a coffee for $3.00. What is the cost of a single pancake?

    <p>$2.25 (C)</p> Signup and view all the answers

    Using the same scenario, what is the cost of a single cup of coffee?

    <p>$0.75 (B)</p> Signup and view all the answers

    BrightTalk Mobile charges $0.25 per minute plus a monthly fee. Sarah's bill was $45 for 150 minutes. Which equation can be used to solve for the monthly fee?

    <p>$0.25 * 150 + m = 45$ (D)</p> Signup and view all the answers

    Using the BrightTalk Mobile scenario, what is the monthly base fee?

    <p>$7.50 (A)</p> Signup and view all the answers

    If a line has a slope of $m = -\frac{4}{3}$ and passes through a point $(0, -7)$, which of the following represents its equation in point-slope form?

    <p>$y+7 = -\frac{4}{3}(x-0)$ (A)</p> Signup and view all the answers

    What do the $x$ and $y$ variables represent when making equations to determine the costs of pancakes and coffee?

    <p>$x$ = cost of per pancake and $y$ = cost per coffee (C)</p> Signup and view all the answers

    If the point slope form of an equation is $y - y_1 = m(x - x_1)$, and the equation is transformed to $y + 7 = -\frac{3}{4}(x + 0)$, what is the slope and point from the transformed equation?

    <p>slope = $-\frac{3}{4}$, point = (0, -7) (A)</p> Signup and view all the answers

    Which of the following inequalities has (7, 0) as a solution?

    <p>$6x - 6y &gt; -18$ (C)</p> Signup and view all the answers

    What is the solution to the inequality $|4x - 7| > 11$?

    <p>$x &lt; -1$ or $x &gt; rac{9}{2}$ (B)</p> Signup and view all the answers

    Which of the following represents a line parallel to the x-axis?

    <p>$y = 9$ (C)</p> Signup and view all the answers

    Which of the following operations would eliminate 'y' in the system of equations: $8x - 9y = 13$ and $16x + 3y = 22$?

    <p>Multiply the second equation by 3, then add the equations. (C)</p> Signup and view all the answers

    Given the system of equations $c - \frac{3}{4}d = 6$ and $c = 4d - 8$, what is the value of 'c' when solved using substitution?

    <p>16 (B)</p> Signup and view all the answers

    Given the system of equations: $\frac{1}{4}f - \frac{1}{3}e = 7$ and $-\frac{1}{3}e + \frac{1}{2}f = 9$. What is the value of 'f' when solved using elimination?

    <p>15, (B)</p> Signup and view all the answers

    Two lines are parallel. Line 1 includes points (1, 3) and (4, 7), and Line 2 includes points (x, 10) and (2, 6). What is the value of x?

    <p>0.5 (D)</p> Signup and view all the answers

    Study Notes

    Module 3: Relations and Functions

    • Function of Time (f(x)): The number of people at a tourist destination varies with the month. f(4) = 5 (people)

    • Transformations of Functions (h(x)): h(x) = -3|x-4|+5. This function is a transformation of the absolute value function, f(x) = |x|. The transformations include a vertical stretch by a factor of 3, translated right 4 units, and translated up 5 units

    • Function Evaluation (f(x) and h(x)): Given f(x)=3x+2 and h(x)=x2 - 1, find 4[f(-2)+h(3)]

    • f(-2)=-4

    • h(3)=8

    • 4(-4 + 8) = 16

    • Function Difference (f(x)): For f(x)=-2x+3, calculate f(3)-f(4)=-3-(-5) = 2.

    • Range of Function: Given a function f(x)=x3+x-5/3 and a domain of {-2, 1, 3}, find the range.

      • f(-2) = -15
      • f(1) = -3
      • f(3) = 25 Range: {-15, -3, 25}
    • Function of Time (f(x)): f(7.5)=7.5

    Module 4: Linear and Nonlinear Functions

    • Slope of a Line: The slope of a line passing through (-3, 5) and (3, 6) is 1/6.
    • Slope of a Line: The slope of a line passing through (-3, 2) and (7, 2) is 0.
    • Identifying Equations of Straight Lines from Graphs:
      • Recognize that the slope-intercept form of a line is y = mx + b.
      • Calculate the slope by identifying two distinctive points (e.g., x-intercept and y-intercept).
      • Determine the y-intercept (the value where the line intersects the y-axis).
      • Formulate the equation.

    Module 5: Creating Linear Equations

    • Finding Monthly Base Fee: Given Sarah's phone bill in August was $45 for 150 minutes, and charges are $0.25 per minute, the monthly base fee = $7.50.
    • Phone Bill Calculation: For 180 minutes in September, the total cost is $52.50.

    Module 6: Linear Inequalities

    • Solving Inequalities: Solve -2y>10 to get y < -5.
    • Inequalities with No Solutions: Some inequalities have no solution. For example, inequalities like 3x+5<3x+7 or 5x+82<-5(x+2) have no solution
    • Solve and Graph Inequality: Solve -8y<-3y+5, to get y > -1.

    Module 7: Systems of Equations and Inequalities

    • Parallel Line: A line parallel to the x-axis will have the equation y=b
    • Solving Systems of Equations: Various methods exist to solve systems of equations, including substitution or elimination.
    • Point-Slope Form: Equations of lines can be represented in various forms such as point-slope form (y-y1 = m(x-x1))
    • Perpendicular Lines: Perpendicular lines have slopes that are negative reciprocals of each other (e.g., if one slope is m, the other is -1/m)

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    Description

    This quiz focuses on key concepts in relations and functions from Algebra Module 3 and 4. Topics include function evaluation, transformations, and the calculation of slopes for linear and nonlinear functions. Test your understanding and application of these mathematical principles.

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