Proportional relationships
11 videos
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Pre-algebra - What Are Proportional Relationships?
Learn what proportional relationships are using pizza slices as an example. Discover the constant ratio, equation y=kx, and how they graph as straight lines through the origin.
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Pre-algebra - Identifying Proportional Relationships from Tables
Learn how to identify proportional relationships in tables by checking if the ratio y/x remains constant across all rows, with examples comparing song prices and homework hours.
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Pre-algebra - Proportional Relationships on Graphs
Learn how to identify proportional relationships on graphs. A proportional relationship must be a straight line passing through the origin (0,0).
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Pre-algebra - The Constant of Proportionality
Learn what the constant of proportionality is, how to find it using y/x, and identify it in tables, equations, and graphs with a pizza slice example.
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Pre-algebra - Finding the Constant of Proportionality - Practice
Learn three methods to find the constant of proportionality (k) from tables, equations, and graphs. k always equals y divided by x.
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Pre-algebra - Writing Proportional Equations
Learn how to write proportional relationships as equations using y = kx, where k is the constant of proportionality found by dividing y by x.
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Pre-algebra - Writing Proportional Equations from Word Problems
Learn how to write proportional equations from word problems by finding the constant k and using y = kx, demonstrated with a bracelet fundraiser example.
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Pre-algebra - Interpreting and Comparing Proportional Relationships
Learn to find and compare the constant of proportionality (k) from equations, tables, and graphs using a pizza shop price comparison example.
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Pre-algebra - Rates with Fractions
Learn how to divide fractions by flipping the second fraction and multiplying. Solve a real-world paint problem to find unit rates using fraction division.
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Pre-algebra - Solving Proportions
Learn to solve proportion problems using cross multiplication. Example: finding how many pizzas to order for 30 people when 5 people eat 2 pizzas.
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Pre-algebra - Proportion Word Problems
Learn to solve proportion word problems using cross multiplication. Example: finding the cost of 14 bags of chips when 4 bags cost $10.