Jawabanmu

2014-04-15T14:56:06+07:00
Y2-y1      -3-1        -4        2
-------- =  --------- =  ----- = - ---
X2-X1      2-(-4)       6        3



Semoga memudahkan dan membantu :D
2014-04-15T15:07:42+07:00
X₁= -4, y₁= 1
x₂=2, y₂=-3

m =  \frac{ y_{2}-  y_{1}  }{ x_{2}-  x_{1}  }
=  \frac{-3-1}{2-(-4)}
= \frac{-4}{6}
= \frac{-2}{3}

jadi, gradien garisnya -2/3