Algebra practice question

Answer: -1/2 or -0.5

The x-intercept is the point (3, 0). Slope = (0 − 2)/(3 − (−1)) = −2/4 = −1/2.

Common wrong answers

If you answered 1/2

1/2 has the wrong sign: the line falls from (−1, 2) to (3, 0).

If you answered -2

−2 is the change in y alone, not divided by the change in x.

If you answered -1

−1 comes from using (3, 0) and (1, 2), misreading the point's x-coordinate.

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