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Applications of rational equations

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Grade 12 Advanced Functions, University Preparation (MHF4U)
C. Polynomial and Rational Functions
43. 12AF.C3.7
43.2 Applications of rational equations

Applications of Equations with Algebraic Fractions

Turn work-rate, distance, and mixture word problems into rational equations you can solve step by step, with clear worked examples.


What You'll Learn

Word problems involving rates, work, and combined tasks often translate directly into equations with algebraic fractions.
The key setup step is writing each quantity as a fraction, such as work rate as 1 divided by time, before combining them into one equation.
Once the equation is set up, clear the denominators, solve the resulting equation, and always check for extraneous or physically impossible solutions.
Work problems and distance-rate-time problems are the two most common categories of rational equation applications.
A solution that gives a negative time, negative speed, or a value that makes a denominator zero must be rejected in context.

What You'll Practice

1

Distance-speed-time problems with trains, boats, and airplanes

2

Work rate problems combining multiple workers with different speeds

3

Area and dimension problems with altered rectangular shapes

4

Consecutive number problems involving reciprocals

Why This Matters

Rational equations help you solve real-world problems involving rates, travel, and work efficiency. Whether you're calculating trip times, project completion, or comparing speeds, these skills apply directly to planning, engineering, and everyday decision-making.

This Unit Includes

7 Video lessons
Practice exercises
Learning resources

Skills

Rational Equations
Word Problems
Distance-Speed-Time
Work Rate
LCD
Cross-Multiplication
Quadratic Equations
Problem-Solving
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