Question

x-y=4
x+y=20
qual e a resposta?

Answer 1

x - y = 4
x + y = 20
-----------------
2x = 24
x = 24/2
x = 12

x + y = 20
12 + y = 20
y = 20 - 12
y = 8

BONS ESTUDOS!

Answer 2

X-Y=4
X+y=20
2x=24
X=24/2
X=12

X-y=4
12-y=4
-y=4-12
-y=-8 (-1)
Y=8