Question

3. If 7x+9y = 42 and 9x+7y = 22 then find the value of (x + y) pls no people who donot ans and come to take points

Answer 1

Answer:

9x +7y =22

-(7x+9y =42)

2x-2y =-20

x-y=-10

y=X+10

put in one

9x +7(X+10) =22

9x +7x +70=22

16x=22-70

16x =-48

x=-3

y=10+X

=10-3

=7

then X+y =7-3=4

hope this is helpful