We have equation:

p = number of phones left to repair
108 = initial amount at the start of week
23 = number of phones repaired each day
d = number of days she worked that week
Answer:
b = 4
Step-by-step explanation:
5b + 4 = 24
5b = 20
b = 4
Answer:
Now plot those points in graph and find intersection hope it helps you.......