dgrayoyfi7s
dgrayoyfi7s
22-03-2018
Mathematics
contestada
4x-7y=3
x+7y=15
solve using elimination
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dannielle
dannielle
22-03-2018
4x-7y=3
x+7y=15
we sum these equations
4x+x-7y+7y=3+15
5x=18
x=18/5
x+7y=15
18/5+7y=15 |*5
18 +35y=75
35y=75-18
35y=57
y=57/35
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