Determine whether b is in Span { a1, a2} (that means 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 x1 a1 + x2 a2 =b. Determine the weights x1 and x2 if they exist. If not, state the reason.

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point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

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