Li is making beaded necklaces. For each necklace, she uses 27 spacers, plus 5 beads per inch of necklaces length. Write an equation to find how many beads Li ne

Question

A.input variable:________________________________________________

B.output variable:________________________________________________

 

C.equation:_______________________________________________________

Answer 1

Well, the expression must "find how many beads," so that is the output.  Let's call that variable y.

 

So, the length of the necklace is the other "variable" value.  It may change independently, so it is called the independent variable, or the input variable.  Let's call that variable x.

 

That says that y (how many beads) depends on x (necklace length).

 

Now, each inch of the necklace has 5 beads (we don't care about how many spacers).  So, the total number of beads is the product (number of beads per inch)*(number of inches).

 

  y = 5x

 

If Li wants a necklace of length 20 inches, she must use:

   y = 5(20)

   y = 100

 100 beads are in a necklace that is 20 inches long