Lesson 3 of 4 · Grade 9 Mathematics
Coordinates, gradient and straight lines
18 min
Gradient
The gradient (slope) measures steepness:
m = (y₂ - y₁) ÷ (x₂ - x₁)
Between (1, 2) and (3, 8): m = (8 - 2) ÷ (3 - 1) = 6 ÷ 2 = 3.
- Positive gradient: line rises to the right.
- Negative gradient: line falls to the right.
- Horizontal line: gradient 0.
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