Let me give you a tip.
you just have to graph those two lines and we all lazy, go to demos.com its a graphing math website you just write what is showing and they graph it for you .
Answer:
r = -189
Step-by-step explanation:
Let's make it easy,
-13=r/9+8
r/9 = -13-8
r/9 = -21
r = -21 × 9
r = -189
He is paid £12.43 per hour
