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linear equations

chapter 5 - straight line graphs

TermDefinition
gradient of a linear equation given two points m = (y2 - y1)/(x2 - x1)
point-slope form of a linear equation y - y1 = m(x - x1)
slope intercept form of a linear equation y = mx + c, where c is a constant
parallel lines have the same gradient
perpendicular lines have gradients that are the negative reciprocals to each other (multiply to be -1)
the cartesian distance between any two given points sqrt((x2 -x1)^2 + (y2-y1)^2)
directly proportional graphs models that use a linear equation that goes through the origin (c=0)
linear models appropriate where the data appears to increase at a constant rate
every model is based on assumptions
(alternative) standard form for a linear equation ax + by + c = 0
Created by: That cool NAMe
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