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m=-a/b
m=-4/-5=4/5
b.-3x+9y-5=0
m=-a/b
m=-(-3/9)=3/9=1/3
c.(-2,5) dan (-1,3)
m=y2-y1/x2-x1
m=3-5/-1-(-2)
m=-2/-1+2
m=-2/1
m=-2
2 persamaan garis
a.(3,4) dg gradien -4
y-y1=m(x-x1)
y-4=-4(x-3)
y-4=-4x+12
4x+y-4-12=0
4x+y-16
b.(-2,-1) dg gradien 3/4
y-y1=m(x-x1)
y-(-1)=3/4(x-(-2))
y+1=3/4(x+2)
4(y+1)=3(x+2)
4y+4=3x+6
0 =3x-4y+6-4
0 =3x-4y+2