Answer :
Company Y:
Cost = C
# of minutes = x
C = 0.10x + 10
Company Z:
Cost = c
# of minutes = x
c = 0.20x
Difference in cost = c - C
c - C = 0.20x - (0.10x + 10)
c - C = 0.10x - 10
Hope this helps! :)
Cost = C
# of minutes = x
C = 0.10x + 10
Company Z:
Cost = c
# of minutes = x
c = 0.20x
Difference in cost = c - C
c - C = 0.20x - (0.10x + 10)
c - C = 0.10x - 10
Hope this helps! :)