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b. [(7p-3) - 4]/[(8-(12-3p)]=5
( 7p-7) / (3p-4) = 5
7p - 7 = 5 ( 3p - 4)
7p-7 = 15p - 20
8p = 13
p=13/8
c. [(7p-3)-3p] / [8 - (5 - 6p)] = 1/2
(4p - 3) / (6p-3) = 1/2
2(4p-3) = 6p - 3
8p -6 = 6p -3
2p = 3
p=3/2
2. m = (yp - yq) / (xp - xq) akan positif jika yp>yq dan xp > yq atau
yp<yq dan xp< xq
3. a. g1= 3k x - 6y = 20
6y = 3kx -20
y = (3kx -20)/ 6
gradien g1 m1= 3k/6.....................(1)
g2. x - 2y = 16
y = (x - 16)/2
gradien g2 m2 = 1/2........................(2)
m1 =m2
3k/6 = 1/2
3k = 3
k =1
b. garis l1 (3k+2)x + ky = 12
ky = 12 - (3k +2)x
y = [12 - (3k +2)x]/k
m1 = -(3k + 2)/k
garis l2 -7x + (k - 6 )y = 16
y = (16 + 7x) / (k -6)
m2 = 7 / (k -6)
m1 = m2
-(3k +2)/ k = 7/(k-6)
-(3k + 2)(k-6) = 7k
-(3k^2 - 16k -12) = 7k
7k + (3k^2-16k-12) = 0
3k^2 -9k -12 =0
k^2-3k - 4 =0
(k -4)(k+1)
jadi k=4 atau k= -1