First, find the slope of your line:
m= y2-y1/x2-x1:
m= 5-3/4--1
m= 2/5
Second, choose a point and plug into y=mx+b to solve for b (y-intercept).
y=mx +b
5 = 2/5(4) +b
5 = 8/5 +b Subtract 8/5 to both sides.
5-8/5 = b find commondenominators & subtract.
25/5 -8/5 =b
17/5 =b
Your final answer/equation of the line is:
y = 2/5x + 17/5
