Linear formulas and equations: Formulas
Formulas
Jack walks at a pace of #5# kilometres per hour. We calculate the distance Jack has walked with the formula #\orange{s} = 5 \cdot \blue{t}#.
Here, the #\orange{\text{distance}}# is denoted in kilometres with the variable #\orange{s}#, and the #\blue{\text{time}}# is denoted in hours with the variable #\blue{t}#. Using this formula, we can calculate the distance #\orange{s}# for different values of time #\blue{t}#.
If Jack walks for #\blue{2}# hours, #\blue{t}=\blue{2}#.
We get #\orange{s}= 5 \cdot \blue{2} = \orange{10}#, so Jack has walked #\orange{10}# kilometers.
If Jack walks for #\blue{4}# hours, #\blue{t}=\blue{4}#.
We get #\orange{s}= 5 \cdot \blue{4} = \orange{20}#, so Jack has walked #\orange{20}# kilometers.
The formula:
\[\orange{s} = 5 \cdot \blue{t} \]
If #\blue t=\blue 2#, then #\orange{s}= 5 \cdot \blue{2} = \orange{10}#
If #\blue t=\blue 4#, then #\orange{s}= 5 \cdot \blue{4} = \orange{20}#
The formula is: #k=3.50 \cdot t + 5.50#
The total costs for skating can be calculated by adding the price of the admission ticket to the number of hours multiplied by the price for #1# hour of skating.
In words, the formula looks like this:
\[\textit{total cost skating}=3.50 \cdot \textit{number of hours} + 5.50\]
Using letters for the variables, we can write this formula a little shorter:
\[k=3.50 \cdot t + 5.50\]
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