3 years ago

A submarine is at a depth of 30m. It descends another 20m and then rises

Mathematics

1 answer:

rodikova [14]3 years ago

6 0

the answer is 10m deep after rising

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X+2y=12 <br> 3x-10y = 0<br><br> y=?<br> x=?

sergeinik [125]

$~~x+2y=12 \\ ~~3x-10y=0 \\
~------ \\~ -3/x+2y=12 \\ ~~~~~~3x-10y=0 \\ ------- \\ -3x-6y=-36 \\ ~~~~3x-10y=0 \\ +------- \\ ~~~~-16y=-36 \\ \\ ~~~~y= \frac{36}{16}\rightarrow \boxed{\frac{9}{4}} \\ \\$
$x+2. \frac{9}{4} =12 \\ \\ x+ \frac{18}{4} =12 \\ \\ \frac{4x+18}{4} =12 \\ \\ 4x+18=48 \\ 4x=30 \\ \\ x=\boxed{\frac{15}{2}}$

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UkoKoshka [18]

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lawyer [7]

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