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# Math 10

### SLS - Math 10 - Ch 5 - Vocabulary

TermDefinition
Domain The x values taken by a relation. (or, how far left and right a relation goes.)
Range The y values taken by a relation. (or, how far down and up a relation goes.)
Interpolate To use a graph to find the x or y value of a point between known (given) points.
Extrapolate To use a graph to find the x or y value of a point beyond known (given) points.
Function A special type of relation that has only one y value for each x. It passes the vertical line test.
Linear Function A straight line that is sloped.
Constant Function A flat (horizontal) line. There is no x variable. For example: y=5
Independent variable The variable plotted on the x axis. Time is usually independent.
Discrete A relation in which given values cannot be joined - it's a series of separate points.
Continuous A type of relation in which the given points are only a few of the valid points. The relation includes infinitely many points in between those.
Direct Variation A linear function that passes through the origin
Partial Variation A linear function that does not pass through the origin.
Constant of Variation In direct variation, the amount the line rises divided by amount it goes to the right between two points. Also called a constant of proportionality.
Fixed value In a partial variation, the value of the dependent variable (y) when the independent variable is 0 (in other words the y intercept).
y intercept In a relation that is graphed, the y value when the x is zero. In other words, the height the graph crosses the y axis at.
x intercept In a relation that is graphed, the x value when the y is zero. In other words, the place(s) the relation touches the x axis.
Created by: slscarrie