Answer
It means that the explanatory variables are independent of each other. That is, a 1-unit change in one of the explanatory variables does not affect the other variables, but the response variable only. The explanatory variables $x_i$ will have an additive effect over the response variable, $y$:
$y=β_0+β_1x_1+β_2x_2+...+β_kx_k$
Work Step by Step
Given above.
