Question

Tentukanlah nilai k dari 2x+ky = -1 dengan penyelesaian (2,1)

Answer 1

2x +ky =-1
2(2) +k(1) = -1
4+ k = -1
k= -1 +(-4)
k=-5

Answer 2

2x + ky = -1 (x=2 dan y=1)
2(2) + k(1) = -1
4 + k = -1
k = (-4) - 1
k = -5
bukti ; 
2(2) + -5(1) = -1
4 - 5 = -1
-1 = -1