Gr 10 Math Ch 5: Linear Functions
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Questions and Answers

What is the first step required to calculate the y-intercept of the equation in the form of $y = mx + c$?

  • Calculate the change in $y$ and $x$.
  • Let $x = 0$ to find the point $(0, c)$. (correct)
  • Let $y = 0$ to find the x-intercept.
  • Determine the slope $m$ of the line.
  • If the slope $m$ of a line is negative, what does this indicate about the graph?

  • The line rises to the right.
  • The line is horizontal.
  • The line falls to the right. (correct)
  • The line is vertical.
  • How is the steepness of a line represented mathematically?

  • By the ratio of the x-intercept to the y-intercept.
  • By the variable $c$.
  • By the y-intercept value alone.
  • By the ratio of vertical change to horizontal change, $m = rac{ ext{change in } y}{ ext{change in } x}$. (correct)
  • Which statement correctly describes the dual intercept method for sketching graphs of the form $y = mx + c$?

    <p>It involves calculating only the x-intercept and y-intercept.</p> Signup and view all the answers

    What points are used to define a straight-line graph in the gradient and y-intercept method?

    <p>The y-intercept and the gradient $m$.</p> Signup and view all the answers

    What does the value of the constant $m$ affect in the equation $y = mx + c$?

    <p>The slope of the graph</p> Signup and view all the answers

    If the value of $m$ is negative, how does the graph behave?

    <p>It slopes downwards from left to right</p> Signup and view all the answers

    Which statement about the y-intercept $c$ is correct?

    <p>$c$ affects where the graph cuts the x-axis</p> Signup and view all the answers

    What is the domain of the function $f(x) = mx + c$?

    <p>All real numbers</p> Signup and view all the answers

    What happens to the graph of $y = mx + c$ when $c$ is greater than zero?

    <p>The graph shifts vertically upwards</p> Signup and view all the answers

    How can the y-intercept of the graph be calculated?

    <p>By setting $x = 0$ in the equation</p> Signup and view all the answers

    When $m = 0$ in the equation $y = mx + c$, what is the nature of the graph?

    <p>The graph is a horizontal line</p> Signup and view all the answers

    What is the range of the function $f(x) = mx + c$?

    <p>All real values of $f(x)$</p> Signup and view all the answers

    What is required to calculate the second point for plotting a graph using the gradient and y-intercept method?

    <p>Determining the change in y using the gradient</p> Signup and view all the answers

    How is the steepness of the line represented in the equation $y = mx + c$?

    <p>By the coefficient $m$</p> Signup and view all the answers

    Which point can be plotted directly from the equation $y = mx + c$ without additional calculations?

    <p>The y-intercept</p> Signup and view all the answers

    Which scenario describes the use of the dual intercept method?

    <p>Using both x-intercept and y-intercept to define the graph</p> Signup and view all the answers

    What does the variable $c$ represent in the equation $y = mx + c$?

    <p>The y-value when $x$ is zero</p> Signup and view all the answers

    What is the effect of increasing the value of $m$ in the equation $y = mx + c$?

    <p>It makes the graph slope upwards more steeply.</p> Signup and view all the answers

    If the equation of a line is given by $y = mx + c$ and $c < 0$, what can be said about the graph's behavior?

    <p>The graph will shift vertically downwards.</p> Signup and view all the answers

    What is the significance of the variable $c$ in the linear function $y = mx + c$?

    <p>It defines the y-intercept of the graph.</p> Signup and view all the answers

    For the linear function $f(x) = mx + c$, which of the following statements is true?

    <p>Both the domain and range encompass all real numbers.</p> Signup and view all the answers

    What does a negative value of $m$ indicate about the direction of the graph of $y = mx + c$?

    <p>The graph slopes downwards from left to right.</p> Signup and view all the answers

    To find the x-intercept of the line described by $y = mx + c$, which value should you set?

    <p>Set $y$ equal to $0$.</p> Signup and view all the answers

    If both $m$ and $c$ are positive, which description fits the graph of $y = mx + c$?

    <p>The graph slopes upwards and intersects the y-axis above the origin.</p> Signup and view all the answers

    Which of the following accurately describes the behavior of a line when $m = 0$ in the equation $y = mx + c$?

    <p>The line has no slope, resulting in a horizontal line.</p> Signup and view all the answers

    What impact does a positive gradient $m$ have on the general behavior of the graph of $y = mx + c$?

    <p>The graph will slope upward from left to right.</p> Signup and view all the answers

    How is the steepness of a line indicated when using the gradient and y-intercept method?

    <p>By the ratio of the vertical change to the horizontal change.</p> Signup and view all the answers

    What is the significance of calculating the x-intercept in the dual intercept method?

    <p>It provides a second point needed to sketch the line.</p> Signup and view all the answers

    If the function $f(x) = mx + c$ is plotted, where $m$ is zero, what can be inferred about the nature of the graph?

    <p>The graph will be a horizontal line at $y = c$.</p> Signup and view all the answers

    When identifying the x-intercept of the line represented by $y = mx + c$, which of the following equations must be resolved?

    <p>$0 = mx + c$ by setting $y$ to zero.</p> Signup and view all the answers

    What effect does a positive value of the constant $c$ have on the graph of the function $y = mx + c$?

    <p>The graph shifts vertically upwards.</p> Signup and view all the answers

    Which characteristic best describes the slope of the graph when $m$ equals zero in the function $y = mx + c$?

    <p>The graph is horizontal.</p> Signup and view all the answers

    In the equation $y = mx + c$, when $m$ is less than zero, how does the graph behave as $x$ increases?

    <p>The graph decreases in value.</p> Signup and view all the answers

    What can be inferred about the range of the function $f(x) = mx + c$?

    <p>The range consists of all possible real numbers.</p> Signup and view all the answers

    What is true about the y-intercept when the value of $c$ is zero in the function $y = mx + c$?

    <p>The graph crosses the y-axis at one point.</p> Signup and view all the answers

    How would the graph behave as $m$ approaches infinity in the equation $y = mx + c$?

    <p>The graph becomes steeper without bounds.</p> Signup and view all the answers

    If both variables $m$ and $c$ are negative in the equation $y = mx + c$, what is the likely shape of the graph?

    <p>The graph has a downward slope and may cross the y-axis.</p> Signup and view all the answers

    To graph the function $y = mx + c$, which point is calculated first if you are determining the x-intercept?

    <p>Set $y = 0$.</p> Signup and view all the answers

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