Linear Equations from Graphs
Grade 9th Grade · Math · 45 min
What's Included
Learning Objective
I can determine the equation of a line that represents a real life problem from its graph.
Warm-Up Video
MooMooMath and Science · 3:13
Interpreting Linear Equations from a graph
Guided Notes
3 key concepts
- 1
To write a linear equation, you need to know the slope (m) and the y-intercept (b); slope-intercept form is written as y = mx + b.
- 2
The slope (m) represents the cost per game, while the y-intercept (b) represents the initial cost, such as the cost for shoe rentals.
- 3
To calculate the cost for a specific number of games, substitute the number of games for x in the equation; to determine how many games can be played with a certain amount, substitute the total amount for y and solve for x.
Practice Questions
11 questions · Short answer
Exit Ticket
Quick comprehension check
“The graph of a line representing the cost of movie tickets for a family shows the y-intercept at $20 and the line passes through the point (4, 60). If x represents the number of tickets and y represents the total cost, determine the equation of the line in slope-intercept form (y = mx + b).”
Complete Lesson Package
Get all 3 ready-to-use resources:
