How do you solve y=-3x and y=x^2 -9x+20 ?

1 Answer
Vinícius Ferraz
May 18, 2018

#(x,y) in {(3 + i sqrt 11, -9 - 3 i sqrt 11),#

#(3 - i sqrt 11, -9 + 3 i sqrt 11)},#

Explanation:

#-3x = x^2 - 9x + 20#

#x^2 - 6x + 20 = 0#

#x = frac{6 ± sqrt {36 - 4 * 20}}{2}#

#x = 3 ± i sqrt {11}#

#y = -3x = -(9 ±3isqrt11)#

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