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Verified answer
X = pa + qbx = p(-i + 4j) + q(2i + j)
= (-pi + 4pj) + (2qi + qj)
= (-p + 2q)i + (4p + q)j
karena x sejajar c, maka x = zc
(-p + 2q)i + (4p + q)j = z(3i - 4j)
(-p + 2q)i + (4p + q)j = 3zi - 4zj
-p + 2q = 3z
z = (-p + 2q)/3
4p + q = -4z
4p + q = -4(-p + 2q)/3
3(4p + q) = -4(-p + 2q)
12p + 3q = 4p - 8q
12p - 4p + 3q + 8q = 0
8p + 11q = 0