Answer:
x = -12
y = 3
Step-by-step explanation:
[tex]1/2x + 6(x+15) = 12\\1/2x + 6x + 90 = 12\\6\frac{1}{2} x + 90 = 12\\6\frac{1}{2} x= -78\\x = -12[/tex]
[tex]y = x + 15\\y = -12 + 15\\y = 3[/tex]
