Question

if ( 1 , 1 ) is a solution of the equation x + y = k , find k​

Answer 1

Answer:

the answer is 1

given that 1 and -1 are the solutions that mean x = 1 and y = -1

~ Which gives us 2(1) + (-1) = K

2-1= K

Therefore 1 = K

Answer 2

Given equation:

2x+3y=k

Now putting x=2 and y =1 in equation

⇒2(2)+3(1)=k

⇒4+3=k

⇒k=7