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no 1)

Mk = -5

sejajar mk= ml = -5

persamaan garis l

y – 5 = -5(x-1)

y -5 = -5x +5

y = -5x +10

5x + y -10 = 0

no 2)

m.m = 4/2 = 2

tega lurus, m.n = -1/m.m = -1/2

persamaan garis n =

y +4 = -1/2(x-2)

y + 4 = -1/2x + 1

y = -1/2x -3

2y = -x -6

x + 2y + 6 = 0