Worked examples
Two examples
Example 1
What is the slope of y = −3x + 7?
- In y = mx + b, the slope is m, the number multiplied by x.
Answer: −3
Example 2
What is the y-intercept of y = 5 − 2x?
- The y-intercept is b, the number on its own, wherever it is written.
Answer: 5
Where this is taught: Quiz 42: Lines, Slope, and Systems, “The equation of a line: y = mx + b”
The drill
Ten problems
How many:
Type each number. A fraction like -2/3 is fine. Then press Check my answers at the bottom.Write each answer on the line. The answer key, with the reasoning, is on the last page.