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y=-2x+1
(x-4)²+(1-2x)²=25
y=1-2x
x²-8x+16+1-4x+4x²-25=0
y=1-2x
5x²-12x-8=0
y=1-2x
Δ=304 √Δ=4√19
x1=(6-2√19)/5 y1=(-7+4√19)/5
x2=(6+2√19)/5 y2=(-7-4√19)/5