Question

Find the value of k so that the pair of equation x+ 2y = 5 and 3x + ky + 15 = 0 has unique silution

Answer 1

by using the condition we can solve it

Answer 2

multiple x+2y=5 by 3

3x+2y=15 and second equation is

3x + ky =-15

so k = 2 then no solution

k is not 2 then unique solution