###
Boundary line

The set of points where the two sides of a two-variable linear inequality are equal.

###
Slope

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

###
Constant of proportionality

A constant ratio of two variables related proportionally.

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Direct variation

A relationship between two variable in which the data increase or decrease together at a constant rate.

###
Linear equation

An equation whose solutions form a straight line on a coordinate plane.

###
Linear inequality

A mathematical sequence using < >≤≥ whose graph is a region with a straight line boundary.

###
Standard form

A way to write numbers by using digits.

###
Point slope form

The equation of a line in the form of Y_2-Y_1=m(X_2-X_1) where m is the slope and (X_(1,),Y_1) is a specific point on the line.

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Slope intercept form

A linear equation written in the form y=mx+b, where m represents slope, and b represents the y-intercept.

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X-intercept

The x-coordinate of the point where the graph of a line crosses the x-axis.

###
Y-intercept

The y-coordinate of the point where the graph of a line crosses the y-axis.

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