Question

for what value of k x =2 and y =-1 is a solution of x +3y -k =0​

Answer 1

Answer:

-1

Let x=2 and y=-1 as given

next substitute it in the equation given

x+3-k=0

2+3 (-1)-k=0

2-3-k=0

-1-k=0

-k=1

k=-1