| Coefficient | Positive (+) | Negative (−) |
|---|---|---|
| $m$ (slope) | Rising to right ↗ | Falling to right ↘ |
| $c$ (y-intercept) | y-intercept > 0 | y-intercept < 0 |
| Line | Equation | Feature |
|---|---|---|
| Horizontal | $y = k$ | slope = 0 |
| Vertical | $x = k$ | slope undefined |
| Through origin | $y = mx$ | $c = 0$ |
📘 MathsKiller Textbook Series | P2-5 Linear Graphs
© 2025 MathsKiller