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Parallel and perpendicular lines
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Learn it Parallel lines have equal slopes. Perpendicular lines have slopes that are negative reciprocals (their product is −1).
Example: Slope perpendicular to $y = \frac{2}{3}x + 1$?
- Flip $\frac{2}{3}$ to $\frac{3}{2}$.
- Change the sign: $-\frac{3}{2}$.
- Check: $\frac{2}{3} \times (-\frac{3}{2}) = -1$ ✓
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