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cluponka [151]
2 years ago
7

An air-conditioning company counted 56 invoices at the end of the month. They charge $450 for a new installation and $75

Mathematics
1 answer:
k0ka [10]2 years ago
8 0

Answer:

14 installatons

42 service calls

Step-by-step explanation:

Let x = no. of new installations

      y = no. of service calls

(1)    x + y = 56           (2)    450x + 75y = 9450

            y = 56 - x               450x + 75(56 - x) = 9450

                                           450x + 4200 - 75x = 9450

                                            375x = 5250

                                                   x = 14 installatons

             y = 56 - 14 = 42 service calls

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