Question: If exactly two predictor x variables are to be used

If exactly two predictor (x) variables are to be used to predict the city fuel consumption, which two variables should be chosen? Why?
Refer to the accompanying table, which was obtained using the data from 21 cars listed in Data Set 14 in Appendix B. The response (y) variable is CITY (fuel consumption in mils-al). The predictor (x) variables are WT (weight in pounds), DISP (engine dis-placement in liters), and HWY (highway fuel consumption in mi/gal).

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