Let a1 a2 3 , and b = -18 Determine whether b can be written as a linear combination of a1 and a2. In other words, determine whether weights x1 and x2 exist, such that x1a1 + x2a2 = b. Determine the weights x1 and x2 if possible. O x1 = 2, x2 = -2 O x1 = 3, x2 = -3 O x1 = 2, x2 = -1 No solution

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