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persamaan garis yg mll titik (4,7) dan (-2,1):
-1-(-7)/y-7 = 2-4 / x-4
6/y-7=-2/x-4
6(x-4)=-2(y-7)
6x-24 = -2y +14
6x+2y-38=0
Titik (-3,k) melalui garis tsb:
6(-3)+2k-38=0
-18+2k-38=0
2k=56
k=28
Nomor 2:
persamaan garis:
-4-3/x-3=-13-1/y-1
-7(y-1)=-14(x-3)
-7y+7=-14x+42
-7y+14x-35=0
Titik A(10,p) mll garis tsb:
-7p+14(10)-35=0
7p=105
p=15