How do you solve the following system using substitution?: $7x+9y=3, x=14-4y$

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How do you solve the following system using substitution?: $7x+9y=3, x=14-4y$

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Answer 1 · 2015-11-02T11:47:13

I found:
$x=-6$
$y=5$

Explanation:

Take the second equation and substitute it for $x$ into the first getting:
$7(color(red)(14-4y))+9y=3$ and solve for $y$ :
$98-28y+9y=3$
$19y=95$
$y=95/19=5$
substitute this back into the second:
$x=14-4(5)=14-20=-6$

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How do you solve the following system using substitution?: $7x+9y=3, x=14-4y$

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How do you solve the following system using substitution?: 7x+9y=3, x=14-4y7x+9y=3, x=14-4y

1 Answer

Explanation:

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How do you solve the following system using substitution?: $7x+9y=3, x=14-4y$