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slope-intercept form

an equation written in the form y=mx+b is in slope-intercept form. The graph is a line with slope m and y-intercept b

best-fitting line

A line that best fits the data points on a scatter plot

positive correlation

in a scatter plot, as x-values increase, y-values increase

negative correlation

in a scatter plot, as x-values decrease, y-values decrease

point-slope form

The equation of a non-vertical line y-y1=m(x-x1)

standard form

A linear equation of the form Ax+By=C where A,B,C are real numbers and A and B are not both zero

linear interpolation

The method of estimating the coordinates of a point that lies between two given data points

linear extrapolation

The method of estimating the coordinates of a point that lies to the right or left of all of the given data points