Question

x=y-5
y=2x+8

qual o valor de X e Y?

Answer 1

y = 2x + 8
x = y - 5

x = (2x + 8) -5
x = 2x + 8 - 5
x = 2x + 3
x - 2x = 3
-x = 3
x = -3

y = 2x + 8
y = 2 (-3) + 8
y = -6 + 8
y = 2