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Pre-Algebra · Axiom Academy
One straight line, three ways to write it. The equation can wear different outfits — but underneath, it's the same line every time. The same line can be written three different ways When you first meet a line, it usually comes dressed as slope-intercept form . But that's just one of three standard outfits — and the trap is thinking different-looking equations must be different lines. They're not. Slope-intercept , point-slope , and standard form can all describe the very same line. Watch one line hold perfectly still while its equation changes clothes. The slope triangle and the intercept light up to match each form — but the line on the grid never moves a pixel. The form changes; the line is the same. Three equations, one line. They look different because each one chooses to show off different information. Move the line — watch all three forms keep up Drag the two sliders to change the line's slope and where it crosses the y-axis . Every time the line moves, all three equations re-write themselves on the spot. They never disagree — because they're always describing the line you're looking at. Three faces, one line — and they always update together. That's what it means for them to be equivalent. Each form hands you something different — for free If they're all the same line, why keep three forms? Because each one wears its useful fact on its sleeve. Tap a form below and watch the graph spotlight exactly what that equation lets you read off without doing any work.
This is the written version of the interactive lesson above. See the full Pre-Algebra course.