# If 2x + y = 9 and 2x – y = 11 , what is the value of x?

2
by Ferderanddvine649

2015-05-15T20:37:46+08:00

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Here is a simple way of solving it
We let:
2x + y = 9 ... [1]
2x - y = 11 ... [2]

[1]-[2]
2x + y =9
-2x -(-y) = -11
2y=-2
y=-1

We just substitute this to one of the equations:
2x-1=9
2x=10
x=5

You can actually just do [1]+[2]

2x +y =9
+2x -y =11
﻿   4x =20
﻿﻿    x=5
anong equation ginmit mo,,tama b yan,,,,db maraming equation s pagsolve ng x??
2015-05-16T10:59:09+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
2x+y=9
2x-y=11

Using elimination method, remove y
4x=20
Divide both sides by 4
x=5

Now to solve y, just substitute the value of x to any equation
2x+y=9
2(5)+y=9
10+y=9
Subtract both sides by 10
y=-1

Hope this helps =)