Question

x+y=4 3x+y=28 adiçao AJUDA URGENTE

Answer 1

x+y=4
3x+y=28

l
x+y=4
x=4-y

ll
3x+y=28
3.(4-y)+y=28
12-3y+y=28
-3y+y=28-12
-2y=16.(-1)
2y=-16
y=$\frac{-16}{2}$
y=-8

l
x=y-4
x=-8-4
x=4