Answer:
y=-2x+5
Explanation:
First, find the slope:
m=(y2-y1)/(x2-x1) ==> slope formula where m is the slope
(–1, 7), (1, 3) ==> (x1=-1, y1=7), (x2=1, y2=3)
m=(3 - 7)/(1 - (-1)) ==> plugin y2=3, y1=7, x2=1, and x1=-1 into the slope formula
m=(-4)/(1 + 1) ==> simplify
m=(-4)/2
m=-2 ==> the slope is -2
y=mx+b ==> slope-intercept equation
3=(-2)(1)+b ==> plugin the slope(m=-2) and point B(1, 3) ==> (x=1, y=3)
3=-2+b ==> solve for b
3+2=-2+2+b ==> add 2 on both sides to isolate b
b=5 ==> simplify
y=-2x+5 ==> plugin the slope and b=5 into the equation