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soldi70 [24.7K]
2 years ago
8

A pair of shoes costs $109 at Sneaker City. At the labor Day sale, they are 20% off. What is the

Mathematics
1 answer:
Alik [6]2 years ago
8 0

Answer: $108.8

Step-by-step explanation: you do 109.00-20% and you get 108.8

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artcher [175]
The two equations are
x + y = 7
and
4x + 2.5y = 22
the first equation can be solved for x to be
x = 7 - y
next you can substitute x in the second equation
4(7 - y) + 2.5y = 22
Distribute 4 to everything in the parentheses
28 - 4y + 2.5y = 22
combine like terms:
28 - 1.5y = 22
subtract 28 from both sides of the equation
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divide both sides by -1.5
y =  4
plug this in to the original equation of x+y=7
x + 4 = 7
subtract 4 from both sides.
x = 3
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