Question

9.


A. She used y-values where she should have used x-values.

B. She did not keep the order of the points the same in the numerator and the denominator.

C. She mixed up the x- and y-values.

D. She should have added the values, not subtracted them.

Answer 1

Answer:

B. She did not keep the order of the points the same in the numerator and the denominator.

Step-by-step explanation:

The formula to calculate slope is:

$\frac{y_{1}-y_{2}}{x_{1}-x_{2}}$

She instead used this formula:

$\frac{y_{1}-y_{2}}{x_{2}-x_{1}}$

The student made the mistake of not keeping the numerators and denominators in the same order.