The estimated regression equation for a model involving two independent variables and 10 observations follows. -33.1260 + 0.612221 + 0,728432 a. Interpret by and ba in this estimated regression equation (to 4 decimals). y changes by 0.6122 when x1 increases by 1 unit and x2 stays the some ba y changes by 0.7284 when x2 increases by 1 unit and x1 stays the same v b. Estimate y when r = 180 and a, = 310 (to 3 decimals)