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If y = 3x + 2 and y = - 4 – 6x what is the value of y?

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If y = 3x + 2 and y = - 4 – 6x what is the value of y?  [#permalink]

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New post 02 Nov 2018, 02:59
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Question Stats:

74% (01:03) correct 26% (00:38) wrong based on 26 sessions

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If y = 3x + 2 and y = - 4 – 6x what is the value of y?

(A) −2/3
(B) 0
(C) 2
(D) 8
(E) 16
Spoiler: OA

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Re: If y = 3x + 2 and y = - 4 – 6x what is the value of y?  [#permalink]

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New post 02 Nov 2018, 10:51
I think its B. Because if you replace y with 0 then x=-2/3.
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Re: If y = 3x + 2 and y = - 4 – 6x what is the value of y?  [#permalink]

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New post 02 Nov 2018, 19:59
pushpitkc wrote:
If y = 3x + 2 and y = - 4 – 6x what is the value of y?

(A) −2/3
(B) 0
(C) 2
(D) 8
(E) 16


\(y = 3x + 2\) ------- (\(i\))

\(y =\) \(-\) \(4\) \(–\) \(6x\) ------ (\(ii\))

Equating equations (\(i\)) and (\(ii\)) we get;

\(3x + 2 =\) \(-\) \(4\) \(-\) \(6x\)

\(3x + 6x =\) \(-\) \(4\) \(-\) \(2 => 9x =\) \(-\) \(6\)

\(x = \frac{- 6}{9} = \frac{- 2}{3}\)

Substituting value of \(x\) in equation (\(i\)) we get;

\(y = 3 (\frac{- 2}{3}) + 2 =\) \(-\) \(2 + 2\)

\(y = 0\)

Answer B
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Re: If y = 3x + 2 and y = - 4 – 6x what is the value of y? &nbs [#permalink] 02 Nov 2018, 19:59
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