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x²+(x-4)²=8
x²+x²-8x+16-8=0 /:2
x²-4x+4=0
(x-2)²=0
x-2=0
x=2
y=2-4=-2
d)
y=5-x
x²+(5-x)²+4(5-x)=0
x²+25-10x+x²+20-4x-5=0
2x²-14x+40=0 /:2
x²-7x+20=0
Δ=7²-4*20=49-80=-31<0
uklad sprzeczny