Answer:
False
Step-by-step explanation:
If (8,9) is a solution, you will be able to substitute 8 for x, and 9 for y.
(-2 x 8) + (4 x 9) = -20?
-2 x 8 = -16
4 x 9 = 36
-16 + 36 = 20
So, (8,9) is not a solution to the system.
