Plan A charges $5 per minute plus a one time monthly fee of $75 and plan B charges $7 per minute, plus a one time monthly fee of $25. After how many minutes will the total cost of the two equations be the same?
costA = 5m + 75
costB = 7m + 25
to be equal ...
7m + 25 = 5m + 75
2m = 50
m = 25
draw the conclusion.