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m1=y2-y1/x2-x1
= -2+4/0+5
= 2/5
tegak lurus dengan (-2,1)
m2= 1/2
m1 x m2 = -1
2/5 x 1/2 =
1/5 = -1
=-5
(-2,1)
=> y-y1 = m (x-x1)
y-1 = -5 (x+2)
y-1 = -5x - 10
y= -5x -9 atau 5x+y+9=0