Question

Write a system of linear equations. solve by graphing. solve analytically by elimination.

Answer 1

A: y = 60x

B: y = 55x + 40

60x = 55x + 40
5x = 40
x = 8

y = 60*8 = 480

The cost for each plumber is the same, $480, after working 8 hours.
The cost is less for 5 hours working with plumber A.
60*5 = 300 , 55*5 +40 = 315