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y=4-2x
x²-4x+4-2x+4y=1-9+x²
y=4-2x
x²-4x-2x+4y-x²=1-9-4
y=4-2x
-6x+4y=-12
y=4-2x
-6x+4(4-2x)=-12
y=4-2x
-6x+16-8x=-12
y=4-2x
-14x=-28
y=4-2x
x=2
y=4-2×2
x=2
y=0