Linear FunctionsSlope, intercepts, the three forms of a line, and what each one is good for.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 Functionslearnposters.com
Linear Functions — printable math wall chart from LearnPosters. Free vector PDF, US Letter and A4.

Questions about the Linear Functions poster

Who is the Linear Functions poster for?
Linear Functions is filed under 8th Grade (ages 13–14), so it matches what that year asks a child to remember. It is equally useful to an older student revisiting math, and to the parent or teacher answering the question at the kitchen table.
When should you use the Linear Functions poster?
The summary sheet for the linear posters in this set. A wall chart earns its place by being glanceable from where the work is happening, so Linear Functions belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
What other posters go with Linear Functions?
Angles and Parallel Lines, Distance and Midpoint and Exponent & Radical Rules sit alongside Linear Functions in the 8th Grade set. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Angles and Parallel LinesDistance and MidpointExponent & Radical Rules
Is the Linear Functions poster free to download and print?
Yes. Linear Functions downloads as a free PDF with no account, no email and no watermark, like everything else in the 8th Grade set. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Linear Functions poster print at?
Linear Functions is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Linear Functions loses nothing.Printing guide

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