Brad wants to buy flowers for his friend with $15. The daisies are $1 each and the roses are $3 each. He buys 3 more daisies than roses how much did the roses cost? -daisies=x- -roses=y-
x+y=15
the sentence how he buys 3 more daisies than roses so... (y=x-3) you then plug in the value of y in the equation to have only one variable... x+ 3(x-3)=15 you then multiply 3 to the parenthesis... x+3x-9=15 then add 9 on both sides... 4x=24 and then divide 4 on both sides... x=6
if you plug the value of x(daisies) in the equation... 6+y=15 you subtract 6 on both sides and get... y=9
you can also get the answer by solving for y with x... y=3(x-3) (x=6) plug in x... y=3(6-3) y=3(3) y=9 Answer: the roses cost $9
