Question

$left { 5x+y = -13 atop x^{2} +y^{2}=13 right.$
с решением

Answer 1

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Answer 2

y=-13-5x
(-13-5x)^2+x^2=13
169+25x^2+130x+x^2-13=0
26x^2+130x+156=0
D=16900-4*26*156=676
x12=(-130+-26)/52=-3 -2
x=-2
y=-3
x=-3
y=2