Question

Resolva Os Sistemas
2x + y - 4 = 0
x + 2 (x-y) = -1

Answer 1

2x + y - 4 = 0  mesmo que y=-2x+4

x + 2 (x-y) = -1
x + 2 (x-(-2x+4)) = -1
x + 2 (x+2x-4) = -1
x + 2 (3x-4) = -1
x+6x-8=-1
7x-8=-1
7x=-1+8
7x=7
x=1

y=-2(1)+4
y=-2+4
y=2