Begin by determining the slope of the line through the points.
(7, 2) (3, -1)
m = (y2 - y1)/(x2 - x1)
m = (-1 - 2)/(3 - 7)
m = -3/-4
m = 3/4
Next, determine the y-intercept.
b = y - mx
b = 2 - 3/4(7)
b = 2 - 21/4
b = 2 - 5 1/4
b = -3 1/4
The equation is: y = 3/4x - 3 1/4
Problem statement: how to find a equation of a line ?
Find the equation of the line that across points (7,2) and (3,-1).