A set of experimental runs was made to determine a way of predicting cooking time y at various levels of oven width x₁, and flue temperature x₂. The coded data were recorded as follows. Estimate the multiple linear regression equation ? _Y?x₁, x₂ = ?₀ + ?₁x₁ + ?₂x₂.

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1.32 2.69 3.56 4.41 5.35 1.15 3.40 6.40 15.05 18.75 30.25 44.85 48.94 51.55 61.50 100.44 111.42 4.10 8.75 14.82 15.15 15.32 18.18 35.19 6.20 7.12 8.87 9.80 10.65 40.40