Your club decides to sell boxes of stationary to raise money. Each box costs you $2.50 and there is a one-time delivery fee
of $30. You plan to sell the stationary for $4.50 per box. Which
equation should you use to determine how many boxes you must
sell to cover your costs. Please help ASAP

To put this information into Slope-Intercept form, you first need to set up a Point-Slope equation. The equation is , where  and  are your given ordered pair and m is the given slope.

  Plug in the given information
y - 7 =  (x - 3)   Use the Distribuitve Property
y - 7 = x -    Simplify 
y - 7 = x - 2   Add 7 to both sides
     y = x + 4