The Cartesian plane is a grid formed by a horizontal number line and a vertical number line that cross at the (0, 0) point, called the origin.
A function is a relation where there is only one output for every input. In other words, for every value of , there is only one value for .
A function rule describes how to convert an input value () into an output value () for a given function. An example of a function rule is .
A linear function is a relation between two variables that produces a straight line when graphed.
Slope is a measure of the steepness of a line. A line can have positive, negative, zero (horizontal), or undefined (vertical) slope. The slope of a line can be found by calculating “rise over run” or “the change in the over the change in the .” The symbol for slope is
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