Finding the Equation of a Straight Line
Learn how to find the equation of a straight line, like , using two points. Let’s get started! 🚀
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🛎️ The Straight Line Formula: y = mx + c
- m is the gradient and tells you how steep the line is.
- c is the y-intercept and shows where the line crosses the y-axis.
🛎️ Finding a Linear Equation Using Two Points
- The gradient is found using m = (y₂ − y₁) ÷ (x₂ − x₁).
- For example, with points (2,3) and (4,7), the gradient is m = (7 − 3) ÷ (4 − 2) = 2.
🛎️ Checking If a Point Lies on a Line
- Substitute (3,5) into y = 2x − 1 to check if 5 = 2 × 3 − 1.
- Because 5 = 5, the point lies on the line.
Practice Questions
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Interactive Activity
Finding the equation of a straight line using 2 points
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