If 3x + 5 = 20, what is x?

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Multiple Choice

If 3x + 5 = 20, what is x?

Explanation:
Solving a linear equation means isolating the variable to find its value. Subtracting 5 from both sides gives 3x = 15. Dividing both sides by 3 yields x = 5. Checking: 3(5) + 5 = 15 + 5 = 20, which matches the equation. The other numbers don’t fit because plugging them in changes the left side away from 20—for example, x = 15 makes 3x + 5 equal 50, x = 3 makes it 14, and x = 6 makes it 23.

Solving a linear equation means isolating the variable to find its value. Subtracting 5 from both sides gives 3x = 15. Dividing both sides by 3 yields x = 5. Checking: 3(5) + 5 = 15 + 5 = 20, which matches the equation. The other numbers don’t fit because plugging them in changes the left side away from 20—for example, x = 15 makes 3x + 5 equal 50, x = 3 makes it 14, and x = 6 makes it 23.

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