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Grade 8 math · F.4 · Intercepts and equations of lines

Slope and y-intercept with fraction slopes

In y = mx + b, m is the slope and b is the y-intercept. For the x-intercept, set y = 0 and solve for x.

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  1. Find the slope and the y-intercept of y = (1/2)x − 4. Write them like 2, -5.

    Answer: 1/2, -4

  2. Find the slope and the y-intercept of y = (2/3)x − 12. Write them like 2, -5.

    Answer: 2/3, -12

  3. Find the slope and the y-intercept of y = (1/3)x − 2. Write them like 2, -5.

    Answer: 1/3, -2

Tip: In y = mx + b, m is the slope and b is the y-intercept. For the x-intercept, set y = 0 and solve for x.

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