One day a store sold 30 sweatshirts. White ones cost $11.95 and yellow ones cost $12.50. In all, $364.00 worth of sweatshirts were sold. How many of each color were sold?
There were 10 yellow and 20 white sweatshirts sold by the store.
Let's call the white sweatshirts
Then we can say:
Solve the first equation for
#11.95(30 - y) + 12.50y = 364.