Question

If 5x + 3y = 17 and 3x + 5y = 7, then x + y = ?
(a) 5 (b) 10 (c)3 (d) 24
​

Answer 1

x+y= 3

since

5x+3y= 17

+ 3x+5y=7

8x+ 8y= 24......(3)

therefore,

diving both sides in (3) by 8,

we get x+y=3

therefore correct option is-

(c) 3