Lines

Slope and intercept

An interactive lesson with 8 steps, about 7 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• $y = mx + b$: slope $m$ (change in $y$ per unit of $x$) and intercept $b$ (the value at $x = 0$).
• Slope from two points: $m = \dfrac{y_2 - y_1}{x_2 - x_1}$.
• Parallel lines have equal slopes. Steepness is the size of the slope.

Steps

1. Growing plant
2. y = mx + b
3. Thread the needle
4. Slope from two points
5. Compute a slope
6. Steeper?
7. Parallel lines
8. Find the intercept