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Grade 12 Advanced Functions, University Preparation (MHF4U)
D. Characteristics of Functions
52. 12AF.D1.6
52.5 Word problems of graphing linear functions
Linear Function Word Problems
Turn a real situation into y = mx + b, then graph the line and answer the question.
What You'll Learn
Linear function word problems model a constant-rate situation with a line.
Translate the words into y = mx + b.
The slope m is the rate of change; the y-intercept b is the starting value.
Example: a $20 fee plus $5 per visit gives C = 5x + 20.
Graph the line or solve the equation to answer the question.
What You'll Practice
1
Graphing cost versus quantity relationships from linear equations
2
Calculating costs for specific quantities using given formulas
3
Solving for number of items when total cost is known
4
Identifying fixed costs and per-unit costs from linear equations
Why This Matters
Understanding cost functions helps you make smart financial decisions in everyday life and business. Whether you're planning events, comparing pricing plans, or running a business, graphing linear functions lets you visualize costs, predict expenses, and find break-even points quickly.
Before You Start — Make Sure You Can:
This Unit Includes
2 Video lessons
Practice exercises
Learning resources
Skills
Linear Functions
Graphing
Slope-Intercept Form
Word Problems
Cost Functions
Fixed and Variable Costs
Dependent and Independent Variables

ON Curriculum Aligned