Solve for x in the equation 3x + 5 = 20.

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Prepare for the Certify Teacher EC-6 (391) Mathematics Exam. Utilize multiple choice questions, flashcards, and explanations to excel in your assessment. Gear up for success!

Multiple Choice

Solve for x in the equation 3x + 5 = 20.

Explanation:
Isolating the variable is the main idea. Start with 3x + 5 = 20. Remove the constant term on the left by subtracting 5 from both sides: 3x = 15. Then divide both sides by 3 to solve for x: x = 5. Check by substituting back: 3(5) + 5 = 15 + 5 = 20, which matches. So x is 5. The other values don’t work because they don’t make the left side equal to 20 (for example, x = 0 gives 5, x = -5 gives -10, x = 15 gives 50).

Isolating the variable is the main idea. Start with 3x + 5 = 20. Remove the constant term on the left by subtracting 5 from both sides: 3x = 15. Then divide both sides by 3 to solve for x: x = 5. Check by substituting back: 3(5) + 5 = 15 + 5 = 20, which matches. So x is 5. The other values don’t work because they don’t make the left side equal to 20 (for example, x = 0 gives 5, x = -5 gives -10, x = 15 gives 50).

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