Question

the line joining (-1 , 1) and (2 , -2) and the line joining (1 , 2) and (2 , k) are parallel to each other find value of k

Answer 1

If the lines are parallel, then their slopes will be equal.

→ (-1 - 2)/(1 + 2) = (1 - 2)/(2 - k)

→ -3/3 = -1/(2 - k)

→ 2 - k = 1

→ k = 1

Answer 2

hope you will understand