Mon Prof Augmenté
Straight Line on Axes
Age 15 · Maths
A straight line crosses a grid with a vertical and a horizontal axis. Its steepness and where it cuts the axes describe how the line behaves.
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Age 15: open this week
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In the picture
- The y-intercept: the point where the line crosses the vertical axis.
- The x-intercept: the point where the line crosses the horizontal axis.
- Another point on the line, used to check its direction.
- The slope triangle: the rise over the run between two points on the line.
Examples
- A phone plan with a fixed monthly fee plus a charge for each gigabyte used.
- A walk at a steady speed, where distance increases by the same amount each minute.
Key takeaways
- The slope tells how much y changes when x increases by 1.
- The y-intercept is the value of y when x is 0.
Quiz: Straight Line on Axes (Age 15)
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What does the y-intercept of a straight line tell you?
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What does the x-intercept of a straight line tell you?
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A straight line passes through (0, 2) and (3, 8). Using a slope triangle, which calculation gives the slope?
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