If \mathbf{10x-2y=-3}10x−2y=−3 and \mathbf{9x+7y=8}9x+7y=8 are true equations, what would be the value of \mathbf{x-9y}x−9y?

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)