Unit 5
The linear function.
The line y = mx + n up close: slope as rise over run, where it crosses the axes, and slope as a rate of change.
Before this unit
The unit, lesson by lesson
Lessons
4 lessons · 16 practice questions · about an hour
Slope
How much a line rises for every step to the right, why that is the same number anywhere on the line, and what a negative slope means.
Where a line crosses the axes
Where a line crosses the y-axis and where it crosses the x-axis, what the number n does to the line, and how to find a line from its two crossing points.
A line through two points
How to get the slope from two points, how to find n after that, and how to write the equation of the line that passes through them.
Rate of change
The slope as a rate, how much something changes every hour, with units. A burning candle, when it runs out, and when two candles are the same height.