9th grade Algebra 1 help??

Write a system of equations to describe the situation below, solve using elimination, and fill in the blanks.

Karlene likes to make desserts for bake sales. Last month, she made 3 batches of brownies and 2 batches of cookies, which called for 13 eggs total. The month before, she baked 3 batches of brownies and 3 batches of cookies, which required a total of 15 eggs. How many eggs did Karlene use for a batch of each dessert?

Karlene uses _____ eggs to make a batch of brownies and _____ eggs to make a batch of cookies.