SOLUTION: solve using the elimination method 10x+5y=52.5 30x-7y=80.5

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Question 449988: solve using the elimination method
10x+5y=52.5
30x-7y=80.5
Answer by rwm(914) About Me  (Show Source):
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multiply first by 3
30x+15y=157.5
30x-7y=80.5
22y=77
divide by 11
2y=7
y=3.5
10x+5y=52.5
10x+5*7/2=52.5
10x=35
x=3.5