Math
posted by Nidhi .
Jack bought 3 slices of cheese pizza and 4 slices of mushroom pizza for a total cost of $12.50. Grace bought 3 slices of cheese pizza and 2 slices of mushroom pizza for a total cost of $8.50. What is the cost of 1 slice of mushroom pizza?

Let x = slices of cheese pizza and y = mushroom.
3x + 4y = 12.5
3x + 2y = 8.5
Subtract second equation from first.
2y = 4
y = 2
I hope this helps. Thanks for asking.