Решите систему уравнений:2х + у = 7, х2 – у = 1.
2x+y=7,
x^2-y=1;
y=7-2x,
x^2-(7-2x)=1;
x^2-7+2x=1,
x^2+2x-8=0,
x1=-4,
x2=2,
y1=15,
y2=3;
(-4;15), (2;3)
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2x+y=7,
x^2-y=1;
y=7-2x,
x^2-(7-2x)=1;
x^2-7+2x=1,
x^2+2x-8=0,
x1=-4,
x2=2,
y1=15,
y2=3;
(-4;15), (2;3)