Question: Simple algebra problem

This is surely the equivalent of using an elephant gun to go after an ant but in any case. Could someone tell me how to sub in four values for y, -2,0,1.5 and 3, one at a time in this equation: 3 1 x = - y - - 2 2 I am only using document mode but can not figure out how to automate this type of problem. I am able to manually sub in the value but I am too lazy to do all that work. Also is there any way to show the steps of the solution and not just pop out the answer? No, I am not the student but only the parent of the student. I am merely attempting to interest my son in math using bells and whistles in place of elbow grease. Thanks for your prayers and/or help on this matter.
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