If I understand you right, this is the sort of thing you need.

In Maple this is the logic

where I have given two forms of the equation to compare.

In Maple T.A. if you create the algorthm as

$TA="y[2]=x[1]/x[2]";

you can use a Maple-graded answer box and use maple-syntax with text entry. Then the grading code would be

a:=solve($RESPONSE);
b:=solve($TA);
evalb(a=b);

You can download a demo of this question from this link.

Here is how I would create this question.

Create a Question Designer question. In the Algorithm enter

$TA = maple("x[A,2] + x[B,2] + x[C,2] <= 110");

Use a Maple-graded answer box with Maple syntax in symbolic mode. For the answer use $TA

In the grading code use

str := $RESPONSE;
ta := $TA;
ans := solve(str);
sol := solve(ta);
sol := map(proc (x) options operator, arrow; expand(convert(convert(x, rational), expln)) end proc, {sol});
ans := map(proc (x) options operator, arrow; expand(convert(convert(x, rational), expln)) end proc, {ans}); evalb(`and`(sol = ans, sol <> {}))

This can be entered in symbolic mode as 

x[A,2] + x[B,2] + x[C,2] <= 110

If you just write in the algorithm section

$dd1 = "&Sigma;";

$dd2 = "&alpha;";

Refresh the algorithm preview. It should show you a greek Capital sigma and lower case alpha below the algorithm section.

Then in the drop-down list you put $dd1 and $dd2 as the item choices, this should work.

Let me know if this solves the problem.