For a multiple regression model with two independent variables, results of the analysis include y = 852,

Question:

For a multiple regression model with two independent variables, results of the analysis include
∑y = 852, ∑x1 = 155, ∑x2 = 88, ∑x1y = 11,423, ∑x2y = 8,320, ∑x1x2 = 1,055, ∑x21 = 2,125, and ∑x22 = 768, n = 100. Solve the normal equations for this regression model, and give the estimates of the parameters.