Writing an Algebraic Expression

Question

Answer each question then write an expression that can be used to solve for any input. Be sure to define the variable.

 

Yasmine is making friendship bracelets for her friends. She uses 3/4 yard of jute to make each bracelet and she already has 5 yards of jute. Two of her friends are allergic to jute, so she must use cotton string, which she already has. How much more jute will she need to buy to make bracelets for her 20 friends?

 

 

Answer 1

x = (20-2) x 3/4  - 5 because first you subtract the 2 who are allergic to jute, then subtract 5 because you already have 5 yds

x= 18 x 3/4 - 5  is the same as  18/1 x 3/4  - 5=13 1/2 - 5 = 8 1/2 yds.