y = -8x - 3
x +y = 7
Is (3, 4) a solution of the system?

Answer:
No
Step-by-step explanation:
x + (-8x - 3) = 7
x -8x - 3 = 7
-7x = 10
x = -10/7
y = -8(-10/7) - 3
y = 80/7 - 3
y = 59/7