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This equation shows how the money Oxford Middle School spends on workbooks is related to the total number of workbooks they buy. $\newline$ $d = 18t$ $\newline$ The variable $t$ represents the number of workbooks bought by the school, and the variable $d$ represents the total cost of those workbooks. How much would it cost Oxford Middle School to buy a total of $1$ workbook? $\newline$ $\$$ $\_\_\_\_$

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Evaluate two-variable equations: word problems

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Q. This equation shows how the money Oxford Middle School spends on workbooks is related to the total number of workbooks they buy.

\newline

d = 18t

\newline

The variable

t

represents the number of workbooks bought by the school, and the variable

d

represents the total cost of those workbooks. How much would it cost Oxford Middle School to buy a total of

1

workbook?

\newline

\$

\_\_\_\_

Plug in $t = 1$ : We have the equation $d = 18t$ , where $d$ is the total cost and $t$ is the number of workbooks. We need to find the cost for $1$ workbook, so we plug $t = 1$ into the equation.
Calculate total cost: Calculate $d$ when $t = 1$ : $d = 18 \times 1$ .
Cost for $1$ workbook: $d = 18 \times 1$ equals $18$ , so the cost for $1$ workbook is $\$18$ .

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