algebra
posted by please please help! on .
brad wants to buy flowers for his friend with $21. The daises are $2 each and the roses are $3 dollars each.He buys 3 more daisies then roses. how much did the roses cost?

He bought X roses, and (X + 3) Daises.
3X + 2(X + 3) = $21,
3X + 2X + 6 = 21,
5X = 15,
X = 3,
3X = 3*3 = $9. = Cost of roses.