If y = 4x and x = 3, what is y?

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Prepare for the Praxis Middle School Mathematics Exam with quizzes. Study with flashcards and multiple choice questions. Each question provides hints and detailed explanations. Ensure success on your test!

Multiple Choice

If y = 4x and x = 3, what is y?

Explanation:
When a variable is defined as a constant times another variable, you find its value by substituting the given number into that expression. Here, y equals four times x, and x is 3. So y becomes 4 × 3 = 12. This matches the relationship y = 4x, so 12 is the value that satisfies the equation. The other numbers wouldn’t satisfy y = 4x with x equal to 3, since they don’t equal 4 times 3.

When a variable is defined as a constant times another variable, you find its value by substituting the given number into that expression. Here, y equals four times x, and x is 3. So y becomes 4 × 3 = 12. This matches the relationship y = 4x, so 12 is the value that satisfies the equation. The other numbers wouldn’t satisfy y = 4x with x equal to 3, since they don’t equal 4 times 3.

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