GTECHS Algebra I Linear Functions

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Last updated 8:17 PM on 10/16/26
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11 Terms

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X-Intercept

The point where a line crosses the x-axis; where y=0

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Y-Intercept

the point where a line crosses the y-axis; where x=0

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Slope

rate of change; rise over run; change in y over change in x

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Slope of an Increasing Line

Positive Slope

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Slope of a Decreasing Line

Negative Slope

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Slope of a Horizontal Line

zero slope

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Slope of a Vertical Line

undefined slope

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Slope-Intercept Form

the linear equation you use when you know the slope and intercept; y=mx+b

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Point-Slope Form

the equation you use when you know the slope and a point on the line; y-y1=m(x-x1)

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Parallel Lines

same distance apart; do not intersect; have the same slope

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Perpendicular Lines

lines that intersect at 90 degrees; slopes are negative reciprocals of each other