algebra
posted by Anonymous on .
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. whay is the cost of one slice of mushroom pizza?

let cost of cheese pizza be x
let cost of mushr. pizza be y
solve
3x + 4y = 1250 and
3x + 2y = 850
hint: subtract the 2nd from the 1st equation