A){-x+y=5
{x+y=5
{y=5+x
{x+5+x=5
{y=5+x
{2x=5-5
{y=5+x
{2x=0 /÷2
{y=5+x
{x=0
{y=5+0
{x=0
{y=5
{x=0
b){2x-1.1y=0.7
{0.5x+1.1y=4.3
{2x=0.7+1.1y /÷2
{0.5x+1.1y=4.3
{x=0.35+0.55y
{0.5(0.35+0.55y)+1.1y=4.3
{x=0.35+0.55y
{0.175+0.275y+1.1y=4.3
{x=0.35+0.55y
{0.275y+1.1y=4.3-0.175
{x=0.35+0.55y
{1.375y=4.125 / ÷1.375
{x=0.35+0.55y
{y=3
{x=0.35+0.55×3
{y=3
{x=3.9
{y=3
c){x-2y=4
{-x+3y=0
{x=4+2y
{-4-2y+3y=0
{x=4+2y
{-2y+3y=4
{x=4+2y
{y=4
{x=4+2×4
{y=4
{x=12
{y=4
Proszę bardzo i pozdrawiam;]