A student finds the slope of the line between (8, 17) and (1, 4). She writes . What mistake did she make?
She mixed up the x- and y-values.
She should have added the values, not subtracted them.
She used y-values where she should have used x-values.
She did not keep the order of the points the same in the numerator and the denominator.
The mistake the student made is:
She used y-values where she should have used x-values.
When finding the slope using the formula (y2 - y1)/(x2 - x1), the x-values should be subtracted in the denominator, and the y-values should be subtracted in the numerator.