Ответы на вопрос:
y=-5x-13
x^2+y^2=13
y=-5x-13
x^2+(5x+13)^2=13 x^2+25x^2+130x+169=13
26x^2+130x+169=13|/13
2x^2+10x+12=0
x1=-3
x2=-2
y=-5x-13 или y=-5x-13
y=2 y=-3
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