Question

$2x + 2y = 15 \\ 2x - 2y = 5$

Answer 1

Hey mate..
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Given,

2x + 2y = 15 .....(1)

2x - 2y = 5 .....(2)

Subtracting (2) from (1) we get,

=> ( 2x + 2y ) - ( 2x - 2y ) = 15 - 5

=> 2x + 2y - 2x + 2y = 10

=> 4y = 10

=> y = 10/4

=> y = 5/2

Putting the value of y = 5/2 in Eq.(1) we have,

2x + 2 × 5/2 = 15

=> 2x + 5 = 15

=> 2x = 10

=> x = 10/2

=> x = 5

Thus,

The required value of x and y are 5 and 5/2 respectively.

Hope it helps !!

Answer 2

heya friend ...✌

Here is your answer...
----------------------------
2x+2y=15 【given】lo lo

2x+2y=5

2x+2y=15

2(x+y)=15

x+y=15/2-----------1)

and again...

2x-2y=5

=>2(x-y)=5..

=>x-y=5/2...............2)

now,,,, if we adding both equations 1). and 2)

we get ......

x+y=15/2
x-y=5/2
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2x=20/2

x=5....now if putting the value on equation 1)

then we get...

x+y=15/2

=>5+y=15/2

y=15/2-5

=>15+10/2

y=5/2=2+1/2 Ans.....

hope it help you...

#@Rajukumar☺☺@