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If 3x + 5y = 9 and 5x + 3y = 7, then what is the value of x + y ?  (A) 2  (B) 16  (C) 9  (D) 7

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If 3x + 5y = 9 and 5x + 3y = 7, then what is the value of x + y ? 

(A) 2 

(B) 16 

(C) 9 

(D) 7

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1 Answer

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Best answer

(A) 2

Adding the given equations, 

3x+ 5y = 9 

5x + 3y = 7

8x + 8y = 16 

∴ x + y = 2 .. [Dividing both sides by 8]

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