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If $f (x) = 3 x - 4$ $f(x) = 3x - 4$ , how do you solve f(x) = 5?

1 Answer

Oct 20, 2015

$x = 3$ $x=3$

Explanation:

If
$XXX f (x) = 3 x - 4$ $color(white)("XXX")f(x)=3x-4$
and
$XXX f (x) = 5$ $color(white)("XXX")f(x)=5$
then
$XXX 3 x - 4 = 5$ $color(white)("XXX")3x-4 = 5$

Add $4$ $4$ to both sides:
$XXX 3 x = 9$ $color(white)("XXX")3x=9$

Divide both sides by $3$ $3$
$XXX x = 3$ $color(white)("XXX")x=3$

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