I keep getting “Slope” questions wrong in Straight Lines. What's the trap?
inverting the formula to (x₂−x₁)/(y₂−y₁).
The usual trap: inverting the formula to (x₂−x₁)/(y₂−y₁). How to avoid it: slope is 'rise over run' — change in y over change in x. Go back to the definition — the steepness of a line, m = (y₂−y₁)/(x₂−x₁) = tanθ.
Key point
Slope
Common mistake
inverting the formula to (x₂−x₁)/(y₂−y₁).
Memory tip
slope is 'rise over run' — change in y over change in x.
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