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x^2 + y^2 = 4
y= -2x + 1
x^2 +(-2x + 1)^2 = 4
x²+4x²-4x+1=4
5x²-4x-3=0
Δ=16+60=76
√Δ=√76=2√19
x=(4-2√19)/10
x=(4+2√19)/10
x=(2-√19)/5
y=-2 (2-√19)/5+ 1
x=(2+√19)/5
y=-2 (2+√19)/5+ 1
x=(2-√19)/5
y= (-4+2√19+5)/5
x=(2+√19)/5
y= (-4-2√19+5)/5
x=(2-√19)/5
y= (1+2√19)/5
lub
x=(2+√19)/5
y= (1-2√19)/5