a.
Let x = # of hours
Let y = cost to rent skates
3 + 2x = y
b.
(Plug in 8 for x, because it is the # of hours)
3 + 2(8) = y
(PEMDAS or order of operations)
3 + 16 = y
19 = y
It costs $19 to rent skates for 8 hours.
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