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m1 = (-5-3)/(-4-2) = -8/-6 = 4/3
m2 tegak lurus m1 --> m2 = -3/4
persamaan garisnya -->(2,3) ; -3/4
y = m2(x-x1) + y1
y = -3/4 ( x- 2) + 3
4y = -3(x-2) + 12
4y = -3x +6 + 12
4y = 3x+ 18
3x +4y -18 = 0
atau cara lain
persamaan garis melalui (2,3) dan (-4,-5)
(-4-2)(y-3)= (-5-3)(x-2)
-6(y-3) = -8(x-2)
3( y-3) =4(x-2)
3y - 9 = 4x- 8 --> 4x - 3y = -1
tegak lurus melalui (2,3)
--> 3x + 4y = 3(2) +4(3)
--> 3x + 4y = 18
3x+4y - 18 = 0