Can you please answer these

Problem Fn1a. Does the following table define y as function of x? Why? In[3]:= mt = {{4, 10.9), {4, 7.3), {4, 3.2), (4, 5.1), (4, 2.4}} ; TableForm [mt, TableHeadings -> {None, {x, y}}] it[3]/TableForm= X y 4 10.9 4 7 .3 4 3. 2 4 5. 1 4 2.4 Problem F1b. Does the following table define y as function of x? Why? In(1]:= mt = {{-1, 2), {4, 2), {6, 2}, {-7, 2}}; TableForm [mt, TableHeadings -> {None, {x, y}}] ut[1)/TableForm= X - 1 NNN/K Fn2. Consider the relation: actor --> movie with this actor Does this relation define a function and why