SOLUTION: Caitlin went to get ice cream at Dairy Queen. 2 scoops cost $2.80. Her friend out 3 scoops and paid $3.75. What is the cost of the cone? What is the cost per scoop? What equation m

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Caitlin went to get ice cream at Dairy Queen. 2 scoops cost $2.80. Her friend out 3 scoops and paid $3.75. What is the cost of the cone? What is the cost per scoop? What equation m      Log On


   

Question 1167675: Caitlin went to get ice cream at Dairy Queen. 2 scoops cost $2.80. Her friend out 3 scoops and paid $3.75. What is the cost of the cone? What is the cost per scoop? What equation models this?
Found 2 solutions by solver91311, Boreal:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!







John

My calculator said it, I believe it, that settles it


I > Ø

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
2S+c=2.80
3S+c=3.75
subtract top from bottom
S=$0.95
so C=$0.90
Alternatively (2, 2.80) (3, 3.75)
slope is $0.95 per cone (linear equation)
y-y1=m(x-x1), m slope and (x1, y1) point
y-2.80=0.95(x-2)
y=$0.95x+$0.90 models this
the slope is the cost per scoop
the intercept is the cost per cone, since s=0.