Answer:
Step-by-step explanation:
10x + 18 = 8y
- 18 - 18
____________
10x - -10
___ = 10
10 ___
10
x = -20
4 + 9x = 5y
- 9 - 9
___________
4 = -4y
_ _
-4 -4
y = -1
