Question

find the value of (x+y) if x- y =3 and 2x +y =5

Answer 1

Step-by-step explanation:

Here,

x-y=3......eqn(1)

2x-y=5....eqn(2)

From eqn (1),

x-y=3

So, x=3+y...eqn(3)

Now, substituting the value of x from eqn(3) to eqn(2), we get,

2x-y=5

or,2(3+y)-y=5

or, 6+2y-y=5

or, 6+y =5

or, y=5-6

y=-1

Putting the value of y in eqn(3),

x=3+y

=3+(-1)

=3-1

=2

Hence,

x=2

y=-1

So,

x+y

=2+(-1)

=1