Y=3x-1

Question

X^2+y^2=12

Then solving with quadratic equation

Answer 1

y = 3x - 1

x^2 + (3x-1)^2 = 12

x^2 + (9x^2 - 6x + 1) = 12

10x^2 - 6x - 11 = 0

I don't see factors for this equation.