Question

x+4y=38, -8x+2y=-36

Answer 1

\(\Large x+4y=38⇒x=38−4y\)
substitute \(\Large x=38−4y\) into \(\Large −8x+2y=−36 \)
\(\Large ⇔−8(38−4y)+2y=−36\)
\(\Large ⇔−304+32y+2y=−36\)
\(\Large ⇔34y=268\)
\(\Large ⇔y=\frac{268}{34}=\frac{134}{17}\) \(\Large \Rightarrow x=38-4\times \frac{134}{17}=\frac{110}{17}\)

Answer 2

how do you figure what formula to use with different algebraic expression and equation

Answer 3

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Answer 4

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Answer 5

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