Unit 3, Lesson 10
Calculating Slope
Grade 8
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| vertical change | horizontal change | slope | |
|---|---|---|---|
| A | |||
| B | |||
| C |
Elena borrowed some money from her brother. She pays him back by giving him the same amount every week. The graph shows how much she owes after each week.
graph of a line on grid, origin O. horizontal axis, time in weeks, scale 0 to 7, by 1's. vertical axis, scale 0 to 20, by 5's. line crosses y axis at 0 comma 18 and crosses the x axis at 6 comma 0.
Answer and explain your reasoning for each question.
One way to calculate the slope of a line is by drawing a slope triangle. For example, using this slope triangle, the slope of the line is
Another way to calculate the slope of this line uses just the points
Notice that in each of the calculations, the value from point
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