Skip to content
PlayOwl

Mathematics · Grade 9

Coordinate Graphs and Rate of Change

Learners read the story a graph tells, compute slope from points, tables and graphs and interpret it as a rate with units, write and graph lines in slope-intercept, point-slope and standard form (including horizontal and vertical lines), and measure the average rate of change of curved relationships over an interval.

  • 4 lessons
  • About 115 minutes
  • Graphs and rates check: 11 questions
  • Ways to answer: choose an answer, type a fraction, draw a graph, plot points, match pairs and type a number
Try it now (no account) One of the five free starter courses Open in PlayOwl

What learners will discover

  • Interpret and connect qualitative graphs with situations, describing increasing, decreasing and constant intervals and relative steepness.
  • Compute slope from two points, a table or a graph, interpret it as a rate of change with units, and identify zero and undefined slopes.
  • Write and graph linear equations in slope-intercept, point-slope and standard form, and find their intercepts.
  • Calculate and interpret the average rate of change of a non-linear relationship over a stated interval.

Lessons

  1. Graphs that tell stories 6 steps4 practiceabout 26 min
  2. Slope as a rate of change 7 steps5 practiceabout 28 min
  3. Three forms of a linear equation 9 steps6 practiceabout 33 min
  4. Average rate of change 7 steps4 practiceabout 26 min
  5. Graphs and rates check 11 questions at the end

Keep exploring

More 9th grade math

Guide for grown-ups