2x-y=5
5x+2y=8
y=2x-5
5x+2(2x-5)=8
y=2x+5
5x+4x-10=8
9x=18
x=2
y=2×2-5
y=-1
(2;-1)
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2x-y=5
5x+2y=8
y=2x-5
5x+2y=8
y=2x-5
5x+2(2x-5)=8
y=2x+5
5x+4x-10=8
y=2x-5
9x=18
y=2x-5
x=2
y=2×2-5
x=2
y=-1
x=2
(2;-1)