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Sejajar = y = 2x+1
m=2
pers
y-y1 = m(x-x1)
y-0=2(x-3)
y-0=2x-6
y=2x-6 (c)
17. melalui = (2,-1)
Tegak lurus = y=1/3X -6
m1=1/3
m2=-3
pers
y-y1 = m2(x-x1)
y+1 = -3(x-2)
y+1 = -3x+6
y = -3x+6-1
y = -3x+5(c)