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{ 5x-y=4
{ x=y
{5x-x=4
{x=y
{x=1
{y=1
{x=1
2.{x+2y=10
x=2
y=4
3. {4x+3y=2 /*(-2)
{7x+6y=2
{-8x-6y=-4
{7x+6y=2
-x =-2
x =2
4x+3y=2
4*2+3y=2
3y=-6
y=-2
4.x=2
y=-3
{2-2*(-3)=8 (?)
{4*2+(-3)=5 (?)
{8=8
{5=5
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