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m = 3
Persamaan garisnya:
y - 1 = 3(x - 2)
y - 1 = 3x - 6
3x - y - 5 = 0
2) y = (1/2)x + 3
m = 1/2
m tegak lurusnya = - 2
Persamaan garis:
y - 3 = - 2(x + 2)
y - 3 = - 2x - 4
2x + y + 1 = 0