Question

resolva os sistema abaixo
a) 2x+y=7
x-y=8

b) x-y=5
3.(x+y)=27

c)2x-y=7
x+5y=-2

d)3a=16+b
2 (a+1)-3 (b+2)a​

Answer 1

a) (x,y)=(5,-3)

b) x-y=5
9x+9y=1

c) (x,y)=(3,-1)