Question 508363
Equation of the line point-slope form
m=(y2-y1)/(x2-x1)

A (4, y) and B (2, 1)
slope = m = 3
m=(y2-y1)/(x2-x1)
3=(1-y) /(2- 4)
3=(1-y) /(-2)
(-2)*3=1-y
-6=1-y
-6-1=-y
-7=-y
Multiply above equation by -1
7=y
y=7