TR 3+ 5) न 9 आणि 57 + 30 न 7, तर 3 + + ची – InterviewSolution

1.

TR 3+ 5) न 9 आणि 57 + 30 न 7, तर 3 + + ची

Answer»

3x + 5y = 9........ (1)5x + 3y = 7.........(2)

Multiply eq(1) by 5 and eq(2) by 3

15x + 25y = 45.....(3)15x + 9y = 21.......(4)

eq(3) - eq(4)16y = 24y = 24/16 = 3/2

Put value of y in eq(1)3x + 5*3/2 = 93x = 9 - 15/23x = 3/2x = 1/2

Therefore,

x + y = 3/2 + 1/2 = 4/2 = 2

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