It is decided to measure the resistance of sheets of a certain metal at temperatures X of 100 K, 200 K, 300 K, 400 K, and 500 K. The resistances Y are found to be 4.7, 7.4, 12.4, 16.5, and 19.8, respectively. If the regression of Y on X is assumed to be linear, state the normal equations for the parameters in the linear model, and solve.