a Every equation has an equals sign and values or expressions on either side of the equalssign. Key phrases such as is,isequalto,equals, or in this case, was, tell us about the placement of the equals sign.
On the left-hand side we have the number of pizza slices sold, which we can assign an arbitrary variable to. We will choose p as our variable.
p=20lessthantwicethenumberofburritos
On the right-hand side, the key words are less than and twice the number. These words tell us the operations that will be used in our equation. Less than indicates subtraction, while twice the number indicates multiplication. If we call the number of burritos b, we can write the right-hand side of the equation.
p=20lessthantwicethenumberofburritosp=2b−20
As for the second equation, we know that $358 was collected. However, we do not know how many pizza slices, p, and burritos, b, were sold. If a pizza slice costs $2.50, we can create an expression describing the cost of p pizza slices.
2.50pdollars
By the same reasoning, if a burrito costs $3, we will pay 3b dollars for b burritos. The sum of these expressions should equal $358.
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