|
Author |
Message |
|
TAGS:
|
|
|
Moderator
Joined: 18 Apr 2015
Posts: 5572
Followers: 89
Kudos [?]:
1117
[0], given: 5159
|
If 3x + 6y = 69 and 2x – y = 11, what is the value of y? [#permalink]
 18 Jul 2018, 16:53
Question Stats:
85% (01:15) correct
14% (02:03) wrong based on 7 sessions
If 3x + 6y = 69 and 2x – y = 11, what is the value of y? enter your value
_________________
Get the 2 FREE GREPrepclub Tests
|
|
|
|
|
|
|
Intern
Joined: 09 Jul 2018
Posts: 10
Followers: 0
Kudos [?]:
7
[1]
, given: 0
|
Re: If 3x + 6y = 69 and 2x – y = 11, what is the value of y? [#permalink]
18 Jul 2018, 17:37
1
This post received
KUDOS
This one is fairly simple algebra. Lets simplify and isolate for x in the first equation:
\(3x + 6y = 69\)
\(x + 2y = 23\)
\(x = 23 - 2y\)
Plug x into the second equation:
\(2x – y = 11\)
\(2(23 - 2y) – y = 11\)
\(46 - 4y - y = 11\)
\(46 - 5y = 11\)
\(46 - 11 = 5y\)
\(35 = 5y\)
\(7 = y\)
The answer is \(y = 7\)
|
|
|
|
|
|
|
Re: If 3x + 6y = 69 and 2x – y = 11, what is the value of y?
[#permalink]
18 Jul 2018, 17:37
|
|
|
|
|
|
|
|
|
close
