Worked examples
Two examples
Example 1
What is the slope of the line y = 4?
- y = 4 is a flat line: y never changes, so the rise is 0.
Answer: 0
Example 2
Which is the equation of the vertical line through (−2, 5)?
- A vertical line keeps the same x everywhere.
- The point has x = −2.
Answer: x = −2
Where this is taught: Quiz 42: Lines, Slope, and Systems, “Flat lines and upright lines”
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.