IXL | Write a two-variable equation

Read the following description of a relationship:

At a make-your-own stuffed animal shop, each animal is filled with

ounces of stuffing.

Let

represent the number of animals made and

represent the total amount of stuffing used in ounces.

This relationship can also be shown in a table. Complete the equation that represents the relationship between

and

a	s
5	35
6	42
7	49
8	56

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Learn with an example

question

Read the following description of a relationship:

Pam is taking care of a friend's dog. She gives the dog

scoops of food each day.

Let

represent the number of days Pam helps and

represent the total number of scoops she gives the dog.

This relationship can also be shown in a table. Complete the equation that represents the relationship between

and

d	s
6	54
7	63
8	72
9	81

solution

Read the description of the relationship between the number of days Pam helps,

and the total number of scoops she gives the dog,

Pam is taking care of a friend's dog. She gives the dog 9 scoops of food each day.

In this relationship,

is the input, and

is the output. So, you can find

by multiplying

by 9.

Express this relationship as an equation.

You can use the table to check your answer.

d	s
6	54
7	63
8	72
9	81

In each row of the table, plug the value from the

column into the equation. See if you get the value in the

column.

d	9 d	s
6	9 ( 6 ) = 54	54
7	9 ( 7 ) = 63	63
8	9 ( 8 ) = 72	72
9	9 ( 9 ) = 81	81

The values in the

column are the same as the values in the

column.

This is the equation for the relationship:

Looking for more? Try these:

Lesson: Writing algebraic expressions

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