5. give an example of an open equation. 6. how can you use an equation to make a prediction from a pattern? 7. pizza costs 1.50 per slice. use a table an equation to represent the relationship between the number of slices of pizza bought and the total cost.

5. An open equation is an equation with one or more variables that may be true or false depending on the values of the variables. An example of and open equation is .

- Notice that if , then

As you can see, when , the open equation is true.

- Let's check what happen if :

Since 15 is not equal to seven, when , the open equation is false.

6. Equations can be used as models to represent how a particular part of the real world works. Since model equations use variables to relate real world quantities, you can use equations to make predictions. For instance, suppose you have the equation

where is the total cost (in dollars) for parking for hours.

You can predict, using the equation, how much we are going to pay for 2 hours of parking.

Using an equation, we predicted that parking 2 hours will cost $1.

7. Let be the total cost of the pizza, and let be the number of slices. We know from our problem that one slice costs 1.50, so x slices will cost . Now the only thing left is relate the total cost and the cost of x slices using an equal sign to create and equation to model the situation:

Notice that we can predict how much is going to cost a pizza of 8 slices just by replacing with 8 in our pizza equation

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