How do you solve $6x-9y=-3$ and $9x+92=y$ using substitution?

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Answer 1 · 2018-05-30T13:21:13

$y=-7$
$x=-11$

$6x-9y=-3$ --- (1)
$9x+92=y$ --- (2)

Sub (2) into (1)
$6x-9y=-3$
$6x-9(9x+92)=-3$
$6x-81x-828=-3$
$75x=-825$
$x=-11$ --- (3)

Sub (3) into (2)
$9x+92=y$
$9(-11)+92=y$
$-99+92=y$
$y=-7$

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