Question

2x+3y=20 ,2x-3y=-4 2(x-y) =?

Answer 1

Heya.....!!!!

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Given 2 equations :-

=> 2x + 3y = 20
=> 2x - 3y = -4

Add these both equations :

=> 4x = 16
=> x = 16 / 4

→ x = 4

So y will be = 4


The Value of => 2 ( x - y ) will be :-»

=> 2 ( 4 - 4 )

➡ 0 is the answer .



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Answer 2

2x + 3y = 20 ...... -1
2x - 3y = -4 ........ -2

Adding 1 and 2,
We get,
4x = 16
x = 4.

Substituting x in equation 1

2(4) + 3y = 20
8 + 3y = 20
3y = 12
y = 4

And so,
2(x-y)= 2(4-4) = 0