IXL | Write a two-variable equation

Read the following description of a relationship:

Meg is running a lemonade stand. She earns $

from each cup of lemonade she sells.

Let

represent the number of cups sold and

represent the total earnings in dollars.

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

and

c	d
7	14
8	16
9	18
10	20

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Learn with an example

question

Read the following description of a relationship:

A chef uses

cherry tomatoes to make each salad.

Let

represent the number of salads and

represent the total number of cherry tomatoes used.

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

and

s	t
7	49
8	56
9	63
10	70

solution

Read the description of the relationship between the number of salads,

and the total number of cherry tomatoes used,

A chef uses 7 cherry tomatoes to make each salad.

In this relationship,

is the input, and

is the output. So, you can find

by multiplying

by 7.

Express this relationship as an equation.

You can use the table to check your answer.

s	t
7	49
8	56
9	63
10	70

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

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

column.

s	7 s	t
7	7 ( 7 ) = 49	49
8	7 ( 8 ) = 56	56
9	7 ( 9 ) = 63	63
10	7 ( 10 ) = 70	70

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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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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