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# If .002x + .004y = 4, what is the value of y in terms of x?

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Joined: 07 Jun 2014
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If .002x + .004y = 4, what is the value of y in terms of x? [#permalink]  03 Apr 2017, 03:53
Expert's post
00:00

Question Stats:

87% (00:36) correct 12% (05:02) wrong based on 8 sessions
If .002x + .004y = 4, what is the value of y in terms of x?

A. $$\frac{4 -2x}{0.04}$$

B. $$\frac{4000 - 0.002x}{0.04}$$

C. $$4 -0.5x$$

D. $$1000 - .5x$$

E. $$2(1000 -x)$$

Drill 3
Question: 8
Page: 319
[Reveal] Spoiler: OA

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GRE Prep Club Legend
Joined: 07 Jun 2014
Posts: 4810
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 118

Kudos [?]: 1897 [0], given: 397

Re: If .002x + .004y = 4, what is the value of y in terms of x? [#permalink]  17 Apr 2017, 09:30
Expert's post
Explanation

We could use algebra here, but most likely you won’t wind up with an answer that looks anything like choice (D). Instead, try plugging in a value for x. Make x something easy such as 1000, which makes y = 500. Plug x = 1000 into each answer choice, and it turns out that only choice D gives you the correct value of 500.

Hence option D is correct!
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Sandy
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Re: If .002x + .004y = 4, what is the value of y in terms of x?   [#permalink] 17 Apr 2017, 09:30
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