Answer:
Tax 3.78 $ and tip 7.56 $
Step-by-step explanation:
42*0.09 = 3.78
42*0.18 = 7.56
b=-1
-7+b=-8
Add 7 to each side to isolate b
-7+7+b=-8+7
b = -1
Answer if you divide them or x them you'll get the answer!
