3x+5y=9 and 5x+3y=7 find the value of x+y. (A) 2 (B) 16 © 9 (D) 7

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3x+5y=9 and 5x+3y=7 find the value of x+y. (A) 2 (B) 16 © 9 (D) 7

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Answer:3x+5y=9

5x+3y=7

adding the two equation

(3x+5x)+(5y+3y)=(9+7)

=> 8x+8y=16

=> 8(x+y)=16

=> x+y=16/8

=> x+y=2