Answer:y=x +3
y=-4x +18
Therefore
x+3=-4x + 18
5x=18-3
5x=15
x=3
y=x +3
y=3+3
y=6
y = 18 - 4x
18 - 4x = x + 3
-5x = -15
x = 3
y = 3 + 3
y = 6
Step-by-step explanation:
