12-07-2016
Mathematics

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Given these equations x+y=9.0

0.50x+0.20y=4.05
What are the values of x and y

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trankieuoanh164 trankieuoanh164

12-07-2016

X= 9.0 -y
=> 0.5(9-Y) +0.2Y=4.05
=> 4.5-0.5Y+0.2Y=4.05
=> 0.45=0.3Y
=> Y= 1.5, X=7.5

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