Question

15 x +17y = 21; 17x + 15y = 1l then find value of x + y.​

Answer 1

Answer:

1

Step-by-step explanation:

15x+17y=21....(1)

17x+15y=11...(2)

multiplying (1) with 17 and (2) with 15

{ to make value of x equal}

205x+289y=357...(3)

205x+225y=165...(4)

subtracting (3) and (4)

64y=192

y = 3

then, putting the value of y in (1)

15x + 17(3)=21

15x+51=21

15x= -30

x= -2

Now , x+y

-2+3 =1

Answer 2

Answer:

1

Step-by-step explanation:

255x+289y=357------1

255x+225y=165-------2

------------------------

64y=192

y=3

1------------x=. -2

X+y=1