Question

A student found the slope of a line that passes through the points (1, 14) and (3, 4) to be 5. What mistake did she make?

Answer 1

m = (y2-y1)/(x2-x1)
= (4-14)/(3-1)
= (-10)/(2)
= -5
slope is -5

Answer 2

The student interchanged the calculations when finding the values of change in x and y;
The student may have started by 14-4 but started with 3-1 for change in x.