Answer: (x,y) = (-3,3)
Explanation:
1. Solve the equation for y
y=9+2x
2. Substitute the given value of y into the equation 5x+y= -12
5x+9+2x= -12
3. Solve x variable
x= -3
4. Substitute the given value of x into the equation y=9+2x
y=9+2x(-3)
5. Solve the equation for y
y=3
Final answer:
x=-3
y=3