PLEASE HELP ME!! THIS IS A MATH TEST!! PLEASE HELP!!

Person A buys 6 granola bars and 4 cups of yogurt for $10.50. Person B buys 4 granola bars and 8 cups of yogurt for $11. Find the cost of each item.

Granola Bar costs:
a cup of yogurt costs:
PLEASE AND THANK YOUUU!!!!!!​