chapter 5 - straight line graphs
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| gradient of a linear equation given two points | m = (y2 - y1)/(x2 - x1)
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| point-slope form of a linear equation | y - y1 = m(x - x1)
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| slope intercept form of a linear equation | y = mx + c, where c is a constant
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| parallel lines | have the same gradient
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| perpendicular lines | have gradients that are the negative reciprocals to each other (multiply to be -1)
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| the cartesian distance between any two given points | sqrt((x2 -x1)^2 + (y2-y1)^2)
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| directly proportional graphs | models that use a linear equation that goes through the origin (c=0)
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| linear models | appropriate where the data appears to increase at a constant rate
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| every model | is based on assumptions
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| (alternative) standard form for a linear equation | ax + by + c = 0
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