Step-by-step explanation:
Answer:
x=-3,y=3
substitute y
-2x-3=x+6
solve for x
3x=-9
x=-3
Substitute x in one equation
y=-3+6
y=3
= (3x² + x + 8) + (x² - 9)
= (3 + 1)x² + x + (8 - 9)
= 4x² + x - 1