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m= y2-y1/(x2-x1)=-4/-8=1/2
grs f sjajar grs g, maka gradien f= gradien g
= 9-1/(3-a)=1/2
atau 8/(3-a)=1/2------> dikali silang
8 x 2 = (3-a) x 1
16=3-a
a= -13