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syarat sejajar = mPQ = mR =
persamaan garir melalui R (2 , 3)
y - yR = mR (x - xR)
y - 3 = (x - 2) ... kedua ruas kalikan dengan 2
2y - 6 = - 3 (x - 2)
2y - 6 = - 3x + 6
3x + 2y - 6 - 6 = 0
3x + 2y - 12 = 0