Question

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

Answer 1

x+2y=5

3x+Ky+15=0

3x+ky= -15

3x+6y=15

y(k-6)=-30

y=-30

k-6=-30

k=-24