Question

Please help!!!!!!!!!!!

Answer 1

x+y=85 and x-y=20

x=85-y x=20+y

85-y=20+y

85-20-y-y=0

65-2y

-2y=65

y=-65/-2

y=32.5

finding x by substituting y=32.5

x+y=85

x+32.5=85

x=85-32.5

x=52.5

.