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scZoUnD [109]
3 years ago
6

Help answer 1/5x-2/3y=30 when y = 15

Mathematics
2 answers:
kiruha [24]3 years ago
7 0
1/5x - 2/3(15) = 30
1/5x - 10 =30
       +10    +10
1/5x = 40
get rid of the fraction 
multiply everything by 5
5(1/5x = 40)5
x = 200
shusha [124]3 years ago
5 0
\frac{1}5x-\frac{2}3y=30

Plug in 15 for y.

\frac{1}5x-\frac{2}3(15)=30

2/3 of 15 is 10.

\frac{1}5x-10=30

Add 10 to each side.

\frac{1}5x=40

Divide each side by 1/5.
(dividing by a fraction is the same as multiplying by its reciprocal...flip 1/5...×5)

\boxed{x=200}
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