Worked examples
Two examples
Example 1
Which graph shows y = 2x − 1?
- The y-intercept is −1: the line crosses the y-axis at (0, −1).
- The slope is 2: from there it goes up 2 for every 1 step to the right.
Answer: The line through (0, −1) and (1, 1)
Example 2
Which graph shows y = −x + 3?
- It crosses the y-axis at (0, 3).
- The slope is −1: it goes down 1 for every 1 step to the right.
Answer: The line through (0, 3) and (3, 0)
Where this is taught: Lines on the Grid, “Matching an equation to a graph”
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.