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Virty [35]
3 years ago
14

Can someone explain how to do this please?

Mathematics
1 answer:
Jobisdone [24]3 years ago
4 0

\bf \begin{cases} \boxed{y}=-2x\\\\ -x-y=4 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{since we know what \boxed{y} is, let's substitute it in the 2nd equation}}{-x-\left( \boxed{-2x} \right)=4\implies -x+2x=4\implies x=4} \\\\[-0.35em] ~\dotfill\\\\ y=-2x\implies y=-2(4)\implies y=-8 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (4,-8)~\hfill

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Answer:

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Step-by-step explanation:

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609.9 is 85% of what number
castortr0y [4]
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609.9 ⇒ 85%
x ⇒ 100%

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faltersainse [42]

Answer:

The value of x is equal to -2/3.

Step-by-step explanation:

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The first step is to substitute 2x into y.

3x - 3(2x) = 2.

The next step is to use distributive property.

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Now we need to add like terms.

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The final step is to divide on both sides to get the value of x.

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We can also check to make sure by redoing the problem, but substituting the value of x.

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The value of x is indeed -2/3.

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