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{2x + 5y=10
{x+4y=11 |*(-2)
{2x + 5y=10
-2x-8y=-22
2x+5y=10
-3y=-12
y=4
y=4
x+4*4=11
y=4
x=-5
{2x+5y=10
{x=11-4y
*{2(11-4y)+5y=10
*22-8y+5y=10
-3y=-12 / :(-3)
y=4
{y=4
{x=11-4*4
{y=4
{x=-5
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