solve

X^2 + Y^2 =70
Y= 2X + 5

1 answer

since y = 2x+5,

x^2+y^2 = 70
x^2+(2x+5)^2 = 70
x^2 + 4x^2+20x+25 = 70
5x^2 + 20x + 25 = 70
x^2 + 4x + 5 = 14
x^2 + 4x - 9 = 0
x = (-4±√52)/2 = -2±√13
y = 1±2√13

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