IXL | Write a two-variable equation

Read the following description of a relationship:

When Matt takes the bus to or from work, the trip takes

minutes.

Let

represent the number of trips and

represent the total number of minutes Matt has spent on the bus.

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

and

t	m
4	28
5	35
6	42
7	49

ref_doc_title.

Learn with an example

question

Read the following description of a relationship:

The maple tree in Jon's backyard is

years younger than the willow tree.

Let

represent the willow tree's age and

represent the maple tree's age.

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

and

w	m
6	3
7	4
8	5
9	6

–

solution

Read the description of the relationship between the willow tree's age,

and the maple tree's age,

The maple tree in Jon's backyard is 3 years younger than the willow tree.

In this relationship,

is the input, and

is the output. So, you can find

by subtracting 3 from

Express this relationship as an equation.

–

You can use the table to check your answer.

w	m
6	3
7	4
8	5
9	6

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

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

column.

w	w – 3	m
6	6 – 3 = 3	3
7	7 – 3 = 4	4
8	8 – 3 = 5	5
9	9 – 3 = 6	6

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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Teacher tools

Work it out

Not feeling ready yet? These can help:

X.4Complete a table for a two-variable relationship

O.12Multiplication input/output tables: find the rule

Lesson: Writing algebraic expressions

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