Question 87529
Isolate a variable:
2x + 2y = 36
x + y = 18
y = 18 - x
Plug:
x^2 - x + 6 = y
x^2 - x + 6 = 18 - x
x^2 = 12
x = sqrt(12) and x = -sqrt(12)
{{{graph(300,300,-4,4,-2,28,18 - x,x^2 - x + 6)}}}