tentukan persanaan dari titik (4,-5) dan (-5,6)

Persamaan garis yg mlalui 2 titik, (x1,y1) dan (x2,y1) :

(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)


Melalui (4,-5) dan(-5,6)
Persamaan garis :
(y - (-5))/(6 - (-5)) = (x - 4)/(-5 - 4)
(y + 5)/11 = (x - 4)/(-9)
Kalikan silang
-9y - 45 = 11x - 44
11x + 9y + 1 = 0

[tex] \frac{Y- Y_{1} }{ Y_{2}- Y_{1} } = \frac{X- X_{1} }{ X_{2}- X_{1} } [/tex]

[tex] \frac{Y-(-5)}{6-(-5)} = \frac{X-4}{-5-4} [/tex]

[tex] \frac{Y+5}{11} = \frac{X-4}{-9} [/tex]

[tex]-9Y-45=-11x-44 [/tex]
-9Y = -11x + 1
   Y = [tex] \frac{11}{9} x[/tex]-[tex] \frac{1}{9} [/tex]