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sleet_krkn [62]
3 years ago
14

a cell phone battery uses 1/3 of its charge in 3/8 of a day. How much charge will it use in one day?​

Mathematics
1 answer:
brilliants [131]3 years ago
3 0

\bf \begin{array}{ccll}charge&day\\\cline{1-2}\frac{1}{3}&\frac{3}{8}\\\\x&1\end{array}\implies \cfrac{~~\frac{1}{3}~~}{x}=\cfrac{~~\frac{3}{8}~~}{1}\implies \cfrac{~~\frac{1}{3}~~}{\frac{x}{1}}=\cfrac{3}{8}\implies \cfrac{1}{3}\cdot \cfrac{1}{x}=\cfrac{3}{8}\\\\\\\cfrac{1}{3x}=\cfrac{3}{8}\implies 8=9x\implies \cfrac{8}{9}=x

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We can solve this by substitution method.

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Therefore, 7x=5y-12

Now replace the 7x in the first equation with 5y - 12:

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Now that we know y, we can find x by substituting in y = 1 into any equation we want. I will use the equation: 7x = 5y - 12

7x=5y-12 (substitute in y = 1)

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__________________________________________________________

<u>Answer:</u>

<u></u>y=1\\x=-1<u></u>

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