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13 Cards in this Set
 Front
 Back
Direct Variation 
A linear relationship between two variables, x and y, that can be written in the form y=kx, where k is a nonzero constant constant. 

Constant of Variation 
The constant k in direct and inverse variation equations. 

Ordered Pair 
A pair of numbers that can be used to locate a point on a coordinate plane. 

Proportional Relationship 
A relationship between two quantities in which of the ratio of one quantity to the other quantity is constant. 

Rate of Change 
A ratio that compares the amount of change in a dependent variable to the amount of change in an independent variable. 

Slope 
A measure of the steepness of a line on a graph; the rise divided by the run. 

Xcoordinate 
The first number in an ordered pair; it tells the distance to move right or left from the origin (0,0). 

Ycoordinate 
The second number in an ordered pair; it tells the distance to move up or down from the origin (0,0). 

Linear Equation 
An equation that contains two or more variables. 

SlopeIntercept Form 
A linear equation written in the form y = mx + b, where m represents slope and b represents the yintercept. 

Solution of a System of Equations 
A set of values that make all equations in a system true. 

System of Equations 
A set of two or more equations that contain two or more variables. 

Yintercept 
The ycoordinate of the point where the graph of a line crosses the yaxis. 