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If x – y = 4 and 2x + y = 5, what is the value of x?
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23 Jun 2018, 11:46
23 Jun 2018, 11:46
Expert Reply
00:00
Question Stats:
95% (00:32) correct
4% (00:11) wrong based on 43 sessions
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Re: If x – y = 4 and 2x + y = 5, what is the value of x?
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01 Jul 2018, 21:43
01 Jul 2018, 21:43
sandy wrote:
Here,
simply add the two equation i. e
\(2x + y = 5\)
\(x - y = 4\)
(+)_____________________
\(3x = 9\)
or \(x = 3\)
Re: If x – y = 4 and 2x + y = 5, what is the value of x?
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16 Jul 2018, 07:01
16 Jul 2018, 07:01
Expert Reply
Explanation
Notice that the first equation has the term –y while the second equation has the term +y.
While it is possible to use the substitution method, summing the equations together will make –y and y cancel, so this is the easiest way to solve for x.
x – y = 4
2x + y = 5
Adding the equations above
3x = 9
x = 3
Notice that the first equation has the term –y while the second equation has the term +y.
While it is possible to use the substitution method, summing the equations together will make –y and y cancel, so this is the easiest way to solve for x.
x – y = 4
2x + y = 5
Adding the equations above
3x = 9
x = 3
