one day a store sold 12 sweatshirts white one cost $9.95 and yellow ones cost $12.50. In all 147.45 worth of sweatshirts were sold how many of each color were sold?
Accepted Solution
A:
x= # of white sweatshirts y= # of yellow sweatshirts
STEP 1: set up quantity and cost equations
QUANTITY EQUATION x + y= 12
COST EQUATION $9.95x + $12.50y= $147.45
STEP 2: solve for one variable in quantity equation
x + y= 12 subtract y from both sides
x= 12 - y
STEP 3: substitute x value in step 2 in cost equation