When backtracking using our flow charts, we undo an operation by using the ____ operation. To solve an equation is to find the value of the ____ variable. A straight line graph is called a ____ graph. A ____ is one of the four divided parts of a Cartesian plane. The point (0,0) is also called the ____. A value on the Cartesian plane is called a ____. ____ is neither positive nor negative. Addition, Subtraction, Multiplying and Dividing are all types of ____. A letter that can represent an unknown number is called a ____.

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