Question

Find the value of k if x = 2 and y = -1is solution of 2x + y = k​

Answer 1

X = 2 and Y= 1
So, 2x+y=k
X= 2x2=4 and y=1
4+1=5
So,k=5

Answer 2

Answer:

l think this is how we have to do

so the answer is (K=3)