If $y=2x-3$ what is $x$ when $y=5$ ?

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Answer 1 · 2016-08-26T15:58:07

$color(green)(x=4)$

If $color(red)(y) = 2color(blue)(x)-3$
then when $color(red)(y)=color(red)(5)$
$color(white)("XX")color(red)(5)=2color(blue)(x)-3$

Adding $3$ to both sides
$color(white)("XX")8=2color(blue)(x)$

Then dividing both sides by $2$
$color(white)("XX")4=color(blue)(x)$
or (equivalently)
$color(white)("XX")color(blue)(x)=4$

If y=2x-3y=2x-3 what is xx when y=5y=5?