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3x+4y=18 |*4
-12x+9y=3
12x+16y=72
25y=72/25
y=2,88
3x+4*2,88=18
4x=18-11,52
4x=6,48/4
x=1,62
(x-2)(x+2)+2y=(x-2)²+y
3x+2y=11
x²-2²+2y=2²-2*x*2+2²+y
3x+2y=11
x²-4+2y=4-4x+4+y
dalej nie wiem :/