Question

Give me explanation of this question

Answer 1

17x+13y=47......1
13x+17y=43......2
On Adding equation 1 & 2 we get
30x+30y=90
30(x+y)=90
x+y=3.......3
On Subtracting equation 1 from 2 We get
x-y =1......4
On Adding equation 2 and 4 we get
2x=4
x=2
Putting the value of x in equation 3
x+y=3
2+y=3
y=1

So, x=2 and y=1
(x+y) = 2+1 = 3