Step 1 ------ Select Estimate Equation Option from Quick Option on the
Menu Bar

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Step2 ----- Type the dependent variable (1st item), constant term (C) and the independent variable(s) (3rd, 4th.... nth item) on the Equation Specification Box. Then choose "Least Squares" in the Estimation Settings" Box and press the "OK" button at last.
1. The First model:

2. The second model:
