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b) 2x+4y=4
x-2y=2 /*2
2x+4y=4
2x-4y=4 dodaj do sb układ równań
4x=8 /: 4
x=2
2-2y=2
-2y=2-2
y=0
c)
Δ=2²-4*2*(-2)
Δ=4+16
Δ=20
√Δ=2√5
x₁=(-2-2√5)/4===> (-1-√5)/2
x₂= (-2+2√5)/4 ==> (-1+√5)/2