4 [5], 9 (a) Write b as a linear combination of a₁ and a2. Let al b a2 = -8 7 and T(a₂) and b = 2 [3] a2. (b) If T: R² → R² is a linear combination such that 9 T(a₁) = [1] 9 52 - 84 a₁ + find T(b).

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