Question

3x+y=-2
-7x+5y=34




substituição

Answer 1

3x+y=-2

-7x+5y=34

y= -2- 3x

-7x+ 5(-2-3x)=34

-7x + ( -10- 15x)=34

-7x-10-15x=34

-22x= 34+10

-22x= 44

x= 44/-22

x= -2

3x+y=-2

3.-2+y= -2

-6+ y= -2

y= -2+6

y= 4