Drag the points to form a line with a slope of 4 and a negative y-intercept.
Understand the Problem
The question is asking how to create a line on a graph with a specific slope of 4 and a negative y-intercept. This involves understanding how slope affects the angle of the line and the position of the y-intercept.
Answer
The line is given by the equation \( y = 4x - 2 \).
Answer for screen readers
The line can be represented by the equation ( y = 4x - 2 ) with a slope of 4 and a negative y-intercept at ( (0, -2) ).
Steps to Solve
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Identify the slope and y-intercept The slope of the line is given as 4, which means for every unit increase in $x$, the value of $y$ increases by 4 units. A negative y-intercept indicates that the line crosses the y-axis below the origin (i.e., where $y < 0$).
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Slope as a ratio The slope can be expressed as a ratio: $$ m = \frac{\text{rise}}{\text{run}} = \frac{4}{1} $$ This suggests that for every unit you move to the right (increase in $x$), you move up 4 units (increase in $y$).
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Determine a suitable y-intercept Since the y-intercept must be negative, we can choose a point from which the line will rise. Let’s say we choose $b = -2$. This gives us the point $(0, -2)$ where the line intersects the y-axis.
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Find additional points using the slope Starting from the y-intercept $(0, -2)$, use the slope to find another point. If you move right 1 unit (to $x = 1$): $$ y = 4(1) + (-2) = 2 $$ So the point is $(1, 2)$.
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Plotting the points The two points to plot are:
- The y-intercept: $(0, -2)$
- The second point using the slope: $(1, 2)$
- Draw the line Connect the two points to form the line with a slope of 4 and a negative y-intercept.
The line can be represented by the equation ( y = 4x - 2 ) with a slope of 4 and a negative y-intercept at ( (0, -2) ).
More Information
The slope of the line indicates that for every 1 unit increase in $x$, $y$ increases by 4 units. The negative y-intercept means that the graph of the line starts below the x-axis, specifically at -2 on the y-axis.
Tips
- Forgetting that a negative y-intercept means the line starts below the x-axis.
- Misunderstanding how the slope affects the positioning of points; ensuring to count correctly both the rise and the run is crucial.
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