Consider the following linear regression model, which links the response variable y with k predictor variables x1, x2,..., xk:y=0 1x1 2x2 ... kxk . If, for example, the slope coefficient 1 equals zero, then the predictor variable x1 does what and implies what? Choose all that answer the 'does what?' and 'Implies what?' questions! Multiple select question. Drops out of the equation Does not drop out of the equation Then x1 influences y Implying that x1 does not influence y