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x+y+4 = 0
y = -x-4
m1 = -1
m1*m2 = -1
-1*m2 = -1
m2 = 1
y-y1 = m2 (x-x1)
y-(-4) =1 (x-(-5))
y+4 = x+5
y-x+4-5 = 0
y-x-1 = 0
Jadi persamaan garis yang tegak lurus dengan garis x + y + 4 = 0 melalui titik (-5,-4) adalah y-x-1 = 0