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Maka:
(-1,p) - (4,10) = k (2,2) - (4,10)
(-5, p-10) = k (-2, -8)
Dari vektor basis i, didapat nilai k:
-5 = -2 k
k = 5/2.
Jadi hal yang sama berlaku untuk basis j, berarti:
p - 10 = k (-8)
p - 10 = 5/2 (-8)
p - 10 = -20
p = -20 + 10 = -10.