I keep getting “Equation forms” questions wrong in Straight Lines. What's the trap?
picking a form that doesn't match the given data.
The usual trap: picking a form that doesn't match the given data. How to avoid it: use point-slope when you have a point and a slope. Go back to the definition — slope-intercept y=mx+c, point-slope y−y₁=m(x−x₁), and two-point forms describe the same line.
Key point
Equation forms
Common mistake
picking a form that doesn't match the given data.
Memory tip
use point-slope when you have a point and a slope.
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