Which is the next step in the following construction of an equilateral triangle

Mathematics

1 answer:

Ira Lisetskai [31]3 years ago

5 0

Answer: its the next portion of 123

Step-by-step explanation:

because my teacher told me

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Solve both by substitution method (algebra 2) and show work please -2x-7y=22 -7x-5y=-1

Alex17521 [72]

$\bf \begin{cases}
-2x-7y=22\\
-7x-5y=-1
\end{cases}\qquad \textit{let's solve the \underline{second one} for "x"}
\\\\\\
-7x-5y=-1\implies -7x=5y-1\implies x=\cfrac{5y-1}{-7}
\\\\\\
\boxed{x=\cfrac{1-5y}{7}}\impliedby \textit{now, let's substitute it in the \underline{first one}}
\\\\\\$

$\bf -2\left( \frac{1-5y}{7} \right)-7y=22\implies \cfrac{10y-2}{7}-7y=22
\\\\\\
\textit{now, let's multiply both sides by 7, to toss the denominator}
\\\\\\
7\left( \cfrac{10y-2}{7}-7y \right)=7(22)\implies 10y-2-49y=154
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-39y=156\implies y=\cfrac{154}{-39}\implies \boxed{y=-4}
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\textit{now, let's use that in the \underline{first one}}
\\\\\\
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\boxed{3=x}$

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MrRa [10]

Answer:

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Step-by-step explanation:

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