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x+2y=5/*(-2)
2x-3y=-4
-2x-4y=-10
-7y=-14/:(-7)
y=2
x+2y=5
x=5-2*2
x=1
x=1
y=2
x+2y=5
x=5-2y
2*(5-2y)-3y=-4
x=5-2y
10-4y-3y=-4
x=5-2y
-7y=-14/:-7
x=5-2y
y=2
x=5-2*2
y=2
x=5-4
y=2
y=2
x=1
x+2y=5|*(-2)
2x-3y=-4
-2x-4y=-10
-7y=-14
y=2
2x-3*2=-4
2x=-4+6
2x=2
x=1