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Vsevolod [243]
2 years ago
7

Two mechanics worked on a car. The first mechanic worked for

Mathematics
1 answer:
Temka [501]2 years ago
4 0
Write a system of equations:

x + y = 125

20x + 15y = 2100

Solving:

x = 125 - y

20(125 - y) + 15y = 2100
2500 - 20y + 15y = 2100
2500 - 5y = 2100
-5y = 2100 - 2500
-5y = -400
y=80

x + 80 = 125
x = 125 - 80
x = 45

The first charges 45$ per hour and the second charges 80$ per hour
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4.5w = 5.1w -30

4.5w - 5.1w = 5.1w - 5.1w -30 (subtracted 5.1w on both sides)

4.5w - 5.1w = -30 (next combine like terms)

-0.6w = -30 (next do the inverse operation of w)

w = -30 ÷ -0.6

w = 50 (it became positive cause minus and minus = positive)

so your final answer is: w = 50

Hope that helps:D


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