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Math Expert V
Joined: 02 Sep 2009
Posts: 65766
If 6x - 4y = 2 and x = 3, then x + y =  [#permalink]

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Difficulty:   5% (low)

Question Stats: 94% (00:27) correct 6% (00:20) wrong based on 31 sessions

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If $$6x - 4y = 2$$ and $$x = 3$$, then $$x + y =$$

(A) 4

(B) 5

(C) 7

(D) 12

(E) 19

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Manager  S
Joined: 07 Jan 2020
Posts: 162
Location: India
Schools: HEC, EDHEC
GPA: 4
Re: If 6x - 4y = 2 and x = 3, then x + y =  [#permalink]

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6x - 4y = 2 , X = 3 then x + y = ?

6*3 -4y = 2
18 - 4y = 2
18 - 2 = 4y
16 = 4y
y = 4

putting vallue of y in x + y = 4 + 3 = 7

PS Forum Moderator P
Joined: 18 Jan 2020
Posts: 1502
Location: India
GPA: 4
Re: If 6x - 4y = 2 and x = 3, then x + y =  [#permalink]

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=> 6x - 4y = 2
Taking 2 common from both sides.
=> 2(3X-2Y) = 2
=> 3x-2y = 1
Where X = 3
=> 3(3)-2y = 1
=> 9-1 = 2y
=> 2Y = 8
=> Y = 4

Therefore X+Y = 3+4 = 7

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Manager  B
Joined: 11 Oct 2019
Posts: 103
Re: If 6x - 4y = 2 and x = 3, then x + y =  [#permalink]

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$$6x + 4y = 2$$
$$6*3 - 4y = 2$$
$$4y = 16$$
$$y = 4$$

$$x+y = 3 + 4 = 7$$
Intern  B
Joined: 13 Oct 2012
Posts: 45
Location: India
Schools: IIM
WE: Operations (Manufacturing)
Re: If 6x - 4y = 2 and x = 3, then x + y =  [#permalink]

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Given that X=3, using that in equation 6x-4y=2
y will be 4

x+y = 4+3=7 (C)
Intern  Joined: 03 Jul 2020
Posts: 9
Re: If 6x - 4y = 2 and x = 3, then x + y =  [#permalink]

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6*3 -4y = 2
18 - 4y = 2
18 - 2 = 4y
16 = 4y
y = 4
y=4 >> in x + y = 4 + 3 = 7 >>>>>>> C Re: If 6x - 4y = 2 and x = 3, then x + y =   [#permalink] 03 Jul 2020, 02:12

# If 6x - 4y = 2 and x = 3, then x + y =  