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Algebra / Linear equations in two variables Difficulty: Easy

The equation $y equals, 0 point 1 x$ models the relationship between the number of different pieces of music a certain pianist practices, y, during an x-minute practice session. How many pieces did the pianist practice if the session lasted 30 minutes?

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Explanation

Choice B is correct. It’s given that the equation $y equals, 0 point 1 x$ models the relationship between the number of different pieces of music a certain pianist practices, y, and the number of minutes in a practice session, x. Since it’s given that the session lasted 30 minutes, the number of pieces the pianist practiced can be found by substituting 30 for x in the given equation, which yields $y equals, 0 point 1 times 30$ , or $y equals 3$ .

Choices A and C are incorrect and may result from misinterpreting the values in the equation. Choice D is incorrect. This is the given value of x, not the value of y.