Z = x^2+x*y+y^2-2*x-3*y+52

Question

Z = x^2+x*y+y^2-2*x-3*y+52

Answer 1

4(-5-y)+y-3(12+5y)+4=0
2y-56+4=0
2y=52
y=26
z=12+5y z=12+130=142
x=-5-y x=-31