A scatterplot of Blood Pressure (mmHg) against Age for some patients, and the scatterplot of residuals against predicted Blood Pressure from the regression line are shown in the figures. On the basis of these plots, would you recommend a re-expression of either Blood Pressure or Age? Explain.

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200 Blood Pressure (mmHg) 50 50 0+ 25 150 100 35 Blood Pressure and Age Plot 45 45 Age 55 65 -58 75