Question

A) x+5y=-7
2x-y=8

B) 2x-y=- 1
2
X+y=2

Answer 1

A) Isolando X,fica x= -7-5y
2.(-7-5y)-y=8
-14-10y-y=8
-11y=22
y=22/-11
y=-2    Substituindo y em x
x= -7-5.(-2)
x=10-7
x=3

B) Corta y ( + e -)
2x=-1
x=-1/+2
-1/2+y=2
y=2+1/-2
MMC 2
y= 4-1
y=3