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If 4(r – s) = –2, then what is r, in terms of s ?

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If 4(r – s) = –2, then what is r, in terms of s ? [#permalink]  03 Jun 2017, 02:50
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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

If 4(r – s) = –2, then what is r, in terms of s ?

A) \frac{-8}{2}

B) s - \frac{1}{2}

C) s - \frac{3}{2}

D) s + 2

E) 2s
[Reveal] Spoiler: OA

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Kudos [?]: 449 [1] , given: 3

Re: If 4(r – s) = –2, then what is r, in terms of s ? [#permalink]  06 Jun 2017, 15:35
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Expert's post
Carcass wrote:

If 4(r – s) = –2, then what is r, in terms of s ?

A) \frac{-8}{2}

B) s - \frac{1}{2}

C) s - \frac{3}{2}

D) s + 2

E) 2s

Given: 4(r – s) = –2 [solve for r]
Expand: 4r - 4s = -2
Add 4s to both sides: 4r = -2 + 4s
Rewrite right side: 4r = 4s - 2
Divide both sides by 4 to get: r = (4s - 2)/4
Check answer choices....not there. Looks like they want us to simplify.

We can use a nice rule that says (a - b)/c = a/c - b/c

So, (4s - 2)/4 = 4s/4 - 2/4
= s - 1/2

[Reveal] Spoiler:
B

Cheers,
Brent
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Re: If 4(r – s) = –2, then what is r, in terms of s ?   [#permalink] 06 Jun 2017, 15:35
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