lportis8065 lportis8065

20-09-2021
Mathematics

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The cost of 1 racket and 3 tennis balls is $52.90.The cost of 3 rackets and 5 tennis balls is $155.50. What is the cost of 1 tennis ball?

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guyshimshon guyshimshon

20-09-2021

X+3y=52.9 /*3

3x +9y= 158.7
3x+ 5y = 155.5

4y = 3.2 /4
Y = 0.8

X +3*0.8 = 52.9
X = 52.9-3*0.8
X = 50.5
racket 50.0 $
Tennis ball 0.8$

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