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If 3x - 2 = 7

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If 3x - 2 = 7 [#permalink] New post 18 Mar 2018, 04:16
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Question Stats:

100% (00:15) correct 0% (00:00) wrong based on 5 sessions
If 3x - 2 = 7, then 4x =

A. 3

B. 5

C. \(\frac{20}{3}\)

D. 9

E. 12
[Reveal] Spoiler: OA

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Re: If 3x - 2 = 7 [#permalink] New post 18 Mar 2018, 06:32
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Explanation
Solve the eqn for X

\(3x-2 =7\)
or \(3x= 7+2\)
or \(3x = 9\)
\(x = 3\)
Hence, \(4x = 4* 3 = 12\)
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Re: If 3x - 2 = 7 [#permalink] New post 07 May 2018, 07:37
Expert's post
Carcass wrote:
If 3x - 2 = 7, then 4x =

A. 3

B. 5

C. \(\frac{20}{3}\)

D. 9

E. 12


amorphous has demonstrated the approach I'd typically use.
That said, here's one more approach - the only rule is that we apply the same operations to BOTH sides:

Given: 3x - 2 = 7
Add 2 to both sides to get: 3x = 9
Multiply both sides by 4/3 to get: (4/3)(3x) = (4/3)(9)
Simplify: 4x = 12

Answer: E

Cheers,
Brent
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Re: If 3x - 2 = 7   [#permalink] 07 May 2018, 07:37
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