SOLUTION: Melissa sold 15 boxes of raisins and made a profit of $5, the next week she sold 25 boxes of raisins and made a $10 profit. Write an expression that relates her profits to the numb

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Melissa sold 15 boxes of raisins and made a profit of $5, the next week she sold 25 boxes of raisins and made a $10 profit. Write an expression that relates her profits to the numb      Log On


   

Question 454761: Melissa sold 15 boxes of raisins and made a profit of $5, the next week she sold 25 boxes of raisins and made a $10 profit. Write an expression that relates her profits to the number of boxes of raisins sold.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Use those numbers as points on a line
(15,5) and (25, 10)
find the slope
(10-5)/(25-15)=5/10=1/2
y=x/2+b
plug in x and y
5=15/2+b
5=7.5+b
b=-2.5
y=x/2-2.5