Find the value of λ, if x =-λ and y = 5/2 is a solution of the equation x+4y-7 =0.

If x = - λ and y = 5/2 is a solution of the equation x + 4y - 7 = 0. Then, x = -λ and y = 5/2 must satisfy the equation x + 4y - 7 = 0.

=>- λ+4(5/2)-7 = 0

=> - λ + 10-7 = 0

=>λ = 3