Astudent finds the slope of the line between (8, 17) and (1, 4). she write 17-4/1-8. what mistake did she make?
a) she mixed up the x- and y-values.
b) she should have added the values, not subtracted them.
c) she used y-values where she should have used x-values.
d) she did not keep the order of the points the same in the numerator and the denominator.

OPTION D.

Step-by-step explanation:

The formula that is used to calculate the slope of a line is:

Where and are two points on the line.

In this case the student finds the slope of the line that passes trough these points:

You can notice that she writes in the numerator that:

So she chose the point as  and the point as .

Then and in the denominator must be:

Therefore, she did not keep the order of the points the same in the numerator and the denominator.

16

step-by-step explanation:

2 x 40 = 80

80/5

= 16

answer: the common difference is -0.10