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Exercises Polynomials and factoring

Example 8.86 from Elementary Algebra, 8.9 Use Direct and Inverse Variation

Use Direct and Inverse Variation: example 8.86

If y varies directly with x and $y = 20$ when $x = 8$ , find the equation that relates x and y.

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

If $y$ varies directly as $x$ and $y = 3, when x = 10 .$ find the equation that relates x and y.

How did it go?

PreviousSolve Uniform Motion and Work Applications: example 8.85 Next Use Direct and Inverse Variation: example 8.87

From Elementary Algebra (1st edition) by OpenStax (Rice University), section 8.9, licensed under CC BY 4.0. Original at openstax.org. We split the solution into steps; the words, numbers and figures are the book's. OpenStax doesn't endorse this site.