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2014-12-02T17:00:54+05:30

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Soo given  x + y = 4 
and 2x - 5y = 1

so from x + y = 4 ⇒ x = 4 - y 

so 2x - 5y = 1 ⇒ 2(4 - y ) - 5y = 1
⇒ 8 - 7y = 1
⇒y = 1

so x = 4 - 1 = 3

so x = 3 , y = 1
1 5 1
2014-12-02T17:03:23+05:30
X+y=4-----------eq(1)
2x-5y=1------------eq(2)
(1)*5  = 5x+5y=20
(2)*1  =2x-5y=1
           7x=21
=x=3

putting x value in (1)
2x-5y=1
=6-5y=1
=-5y=-5
=y=1


    

1 4 1
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