Question

Bantu kawan!!!
jika garis 4x + 2y = 5, tegak lurus dengan garis mx + (2m - 1)y = 9.
maka nilai m adalah....

Answer 1

4x + 2y = 5 --> m1 = -4/2 = -2
mx + (2m-1)y = 9 --> m2 = -m/(2m-1)
..
m1 ,m2 = -1
(-2)  (-m /(2m-1)) = -1
2m = -2m + 1
4m = 1
m = 1/4 

Answer 2

2y=5-4x
y=5/2-2x,gradinnya=-2
mx+(2m-1)y=9,gradien=1/2
y=(9-mx)/(2m-1)
gradiennya=1/2=-m/(2m-1)
-2m=2m-1
4m=1
m=1/4
semoga nggak salah ya...........