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Which of the following describes the correct process for solving the equation 3x + 6 = 21 and arrives at the correct solution?

A. Divide both sides by 6 and then add 3. The solution is x = 5.
B. Add 6 to both sides of the equation and then divide by 3. The solution is x = 9.
C. Subtract 6 from both sides of the equation and then divide by 3. The solution is x = 8.
D. Subtract 6 from both sides of the equation and then divide by 3. The solution is x = 5.

Respuesta :

texaschic101
3x + 6 = 21...subtract 6 from both sides
3x + 6 - 6 = 21 - 6
3x = 15...divide both sides by 3
x = 15/3
x = 5....answer is D

Answer:

D. Subtract 6 from both sides of the equation and then divide by 3. The solution is x = 5.

Step-by-step explanation:

3x + 6 = 21

Step 1: Subtract 6 from both sides, we get

3x + 6 - 6 = 21 - 6

3x = 15

Step 2: Dividing both sides by 3, we get

3x/3 = 15/3

x = 5

Therefore, answer D. Subtract 6 from both sides of the equation and then divide by 3. The solution is x = 5.

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