jenny is making tie-dye shirts for her class with her school colors, blue and yellow. she used a total of 8 ounces of fabric paint. the amount of blue paint is 3 times the amount of yellow paint.

Let's call the amount of yellow paint used Y ounces.

Since the amount of blue paint used is 3 times the amount of yellow paint, the amount of blue paint used is 3Y ounces.

Therefore, the total amount of fabric paint used is Y + 3Y = 4Y ounces.

Since the total amount of fabric paint used is 8 ounces, we can set up the equation:
4Y = 8

Dividing both sides by 4, we find:
Y = 2

So, Jenny used 2 ounces of yellow paint and 3 times that amount for blue paint, which is 6 ounces.

Therefore, Jenny used 2 ounces of yellow paint and 6 ounces of blue paint for the tie-dye shirts.