Rozwiąż rachunkowo układ:
x - y + 1 = 0
y=x+1x^2+(x+1)^2-6x-7=0x^2+x^2+2x+1-6x-7=02x^2-4x-6=0x^2-2x-3=0delta=4-4*1*(-3)=16x1=(2-4)/2=-1x2=3 x1=-1y1=0 x2=3y2=4
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y=x+1
x^2+(x+1)^2-6x-7=0
x^2+x^2+2x+1-6x-7=0
2x^2-4x-6=0
x^2-2x-3=0
delta=4-4*1*(-3)=16
x1=(2-4)/2=-1
x2=3
x1=-1
y1=0
x2=3
y2=4