Question

If 17x + 23y =40 and 23x + 17y =80, then x+y =......?......​

Answer 1

Answer:

x+y=3

Step-by-step explanation:

$17x + 23y = 40 \\ 23x + 17y = 80 \\ addthe \: above \: equations \\ 40x + 40y = 120 \\ 40(x + y) = 120 \\ x + y = \frac{120}{40} = 3$