Question

4x+2y=2 x+3y=8 substituicao

Answer 1

{4x+2y=4.....(:2) => 2x+y =2.....y=2-2x 
{3x-4y=0 
3x-4(2-2x) =0 
3x-8+8x=0 
11x=8 
x=8/11 

y=2-x= á 2  

Answer 2

4x+2y=2
x+3y=8

x=8-3y

4(8-3y)+2y=2
32-12y+2y=2
32-10y=2
32-2=10y
30=10y
y=30/10
y=3

x+3y=8
x+3*3=8
x+9=8
x=8-9
x= -1