Question 969476
$2 per hour is the same as 2 * x where x is the number of hours. 
since there is a $2 deposit regardless of how many hours you rent the bike you would + 2 to the equation.
{{{y=2x+2}}}


x is a variable because the number of hours will vary. you can rent it for 2 hours, or 3 hours, or 4 hours.
The number can change many times.
the $2 deposit will never change. this is considered a constant. because it is constantly the same.


if you wanted to rent the bike for 4 hours it would cost you $10
{{{y=2(4)+2}}}
{{{y=8+2}}}
{{{y=10}}}


Here is a visual of the line:

{{{ graph( 300, 300, -5, 10, -5, 30, 2x+2) }}}

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