The residual plots of each independent variable are plotted against the dependent variable. We can attempt to evaluate the significance of the spread of the residuals. None of the residuals plotted are forming any particular pattern, in this instance:
Figure 2.17.1: Residuals by regressors
Similar to Figure 2.17.1, in Figure 2.17.2, we see no particular pattern of residuals for both of the regressors plotted:
Figure 2.17.2: Residuals by regressors