Question

For his long distance phone service, Dale pays a
$6
monthly fee plus
8
cents per minute. Last month, Dale's long distance bill was
$13.92
. For how many minutes was Dale billed?

Answer 1

Equation;
y=6+0.08x
Last month, Dale's long distance bill was 
$13.92
so,
$13.92=6+0.08x
0.08x=$13.92-6
0.08x=$7.92
x=99 minutes