Question

Mark stated that the slope of the line that passes through these two points (1, -19) and (-2, -7) is -¼. Is Mark correct? Explain. (show your work).

Answer 1

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Answer:

no

Explanation:

The slope formula is ...

m = (y2 -y1)/(x2 -x1)

We can use the values ...

(x1, y1) = (1, -19)

(x2, y2) = (-2, -7)

Putting these into the formula gives ...

m = (-7 -(-19))/(-2 -1) = 12/-3 = -4

The slope is -4, not -1/4. Mark is incorrect.