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domain

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

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function

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

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function rule

an equation that describes a function.

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linear equation

an equation whose graph is a line.

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linear inequality

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

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negative correlation

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

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no correlation

there is no relationship between data sets.

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positive correlation

both sets of data values increase.

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range

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

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relation

a set of ordered pairs.

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scatter plot

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

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slope

a ratio that describes the tilt of a line.

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slope-intercept form

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

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solution

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

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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

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vertical-line test

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

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y-intercept

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

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point-slope form

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

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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.

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x-intercept

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

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