Question

Resolva a equação
X+Y=12
X-Y=8

Answer 1

X+Y=12
X-Y=8

x=12-y
12-y-y=8
-2y=-4
y=2
x=10

Answer 2

x= 12 - Y

(12-Y) - Y = 8
- 2Y = 8 -12
-2Y = -4
2Y = 4
Y = 4/2
Y =2