Question 188389
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Total Bill = Parts + Labor ------> Working Eqn

*Take note: <font color=blue>Labor = rate x no. of hours</font>
Let <font color=blue>x=no.of hours</font>


Substitute all given to our Working Eqn:



$1603= $532 + <font color=blue>($63/hr)(no. of hours)</font>
$1603-$532=($63)(x)
$1071=($63)(x),  divide both side by 63:
x=$1071/$63= <font color=red>17hrs</font> total hours of labor


Check,
$1603 = $532 + $63 (17hrs)
$1603 = $532 + $1071
$1603 = $1603


Thank you,
Jojo</font>