Question

All three points are displayed on the line. Find an equation relating x and y.

(4,3)

(12,9)

Answer 1

Use point slope formula.
first find the slope 9-3 / 12-4 = 6/8 = 3/4

y-9=3/4(x-12)

Answer 2

Sally travels 3 miles east and then 4 miles north to get to school while Casey travels 9 miles east and 12 miles north to get to school.