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the set of first coordinates of the ordered pairs of a relation.


a relation where each number in the domain is paired with exactly one number in the range.

function rule

an equation that describes a function.

linear equation

an equation whose graph is a line.

linear inequality

looks like a linear equation, but with an inequality symbol.

negative correlation

one set of data values increase as the other set decreases.

no correlation

there is no relationship between data sets.

positive correlation

both sets of data values increase.


the set of second coordinates of the ordered pairs of a relation.


a set of ordered pairs.

scatter plot

a graph with points plotted to show a possible relationship between two sets of data.


a ratio that describes the tilt of a line.

slope-intercept form

y=mx+b, where m is the slope and b is the y-intercept of the line.


is any value or values that make an equation or an inequality true.

line of best fit

a line drawn in a scatter plot to fit most of the dots and shows the relationship between the two sets of data

vertical-line test

is something that allows you to describe graphically whether a relation is a function.


the y-coordinate of the point where the line crosses the y-axis.

point-slope form

y-y1 = m(x-x1), where m is the slope and (x1,y1) is the point the line is passing through.

standard form of a linear equation

Ax + By = C, where A,B, and C are real numbers, and A and B are not both zero.


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

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