Create and solve a one-variable linear equation from a short context.
Write and solve a one-variable equation for equal groups
Problem
Four notebooks cost \(\$28\) total. Write an equation for the cost \(n\) of one notebook and solve it.
Big Picture
What this problem is really about
The unknown is one notebook’s cost, and the four identical costs combine to make the total. We’ll represent one cost with n, multiply by the number of notebooks, and set that product equal to the given total. Then dividing by the number of equal groups isolates the cost of a single notebook.
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