Linear FunctionsSlope, intercepts, the three forms of a line, and what each…8th GradeSLOPE — rise over runrunrisem = (y₂ − y₁) / (x₂ − x₁)Positive → uphill. Negative → downhill.Zero → horizontal. Undefined → vertical.Always subtract in the same order, top and bottom.THE THREE FORMSSlope-intercepty = mx + bbest for graphing — b is where it crosses the y-axisPoint-slopey − y₁ = m(x − x₁)best when you have a point and the slopeStandardAx + By = Cbest for intercepts — set x = 0, then y = 0GRAPHING FROM y = mx + b1Plot b on the y-axis — that is your starting point.2From there, count the rise, then the run, and plot a second point.3Repeat once more, then join the three points with a straight line.Parallel lines: same m. Perpendicular lines: slopes multiply to −1.Linear Functionswww.littleactivity.com

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Math · 8th Grade

Linear Functions

Slope, intercepts, the three forms of a line, and what each one is good for.

How to use it

The summary sheet for the linear posters in this set.

Free · print-ready PDF · US Letter and A4

Grade
8th Grade
Ages
13–14
Subject
Math
Pages
1

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49 more posters, all free to print — 11 of them here.

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