Question

Which equation has the solution x = 3? A. 3x + 1 =9 B. x/3 + 5 = 6 C. 5x - 7= 1 D. 9 - 3x = 0 E. 2x + 4 = 10 F. 9/x - 1 = 4

Answer 1

Answer: D.

Steps

Equation: 9 - 3x = 0

Subtract 9 from both sides

9 - 3x - 9 = 0 - 9

Simplify

-3x = -9

Divide both sides by -3

-3x / -3  =  -9 / -3

Simplify

-3x / -3

Apply the fraction rule: -a / -b  =  a / b

= 3x / 3

Divide the numbers: 3 / 3 = 1

= x

Note: x has the same value as 1

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Divide the numbers:  -9 / -3 = 3

x = 3