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This equation shows how the money Lanberry Middle School spends on workbooks is related to the total number of workbooks they buy. $\newline$ $d = 20t$ $\newline$ 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 Lanberry Middle School to buy a total of $1$ workbook? $\newline$ $\$$ $\_\_\_\_$

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Find a value using two-variable equations: word problems

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

\newline

d = 20t

\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 Lanberry Middle School to buy a total of

1

workbook?

\newline

\$

\_\_\_\_

Set $t$ value: $t = 1$ because we're finding the cost for $1$ workbook.
Substitute $t$ into equation: Plug in $t = 1$ into the equation $d = 20t$ to find $d$ . $\newline$ $d = 20 \times 1$
Calculate total cost: Calculate the total cost. $d = 20$

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