Question

Which equation has a solution of x = 4

Answer 1

Answer

Option B is correct.

Only the equation, 3x + 9 = 21, has a solution of x = 4.

Explanation

We are told to pick the equation(s) with x = 4 as a solution from the equations,

5x - 8 = 44

3x + 9 = 21

4x = 24

x - 10 = -8

The step to solving this is to insert x = 4 and check if that is consistent with the given equation.

Option A

5x - 8 = 44

If x = 4

5(4) - 8 = 44

20 - 8 = 44

12 ≠ 44

Hence, this is not an answer

Option B

3x + 9 = 21

If x = 4

3(4) + 9 = 21

12 + 9 = 21

21 = 21

Hence, this is an answer for this question.

Option C

4x = 24

If x = 4

4(4) = 24

16 ≠ 24

Hence, this is not an answer to this question.

Option D

x - 10 = - 8

If x = 4

4 - 10 = -8

-6 ≠ -8

This is also not an answer to this question.

Hope this Helps!!!