$${\mathtt{y}} = \left({\mathtt{4.956}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{2}}}\right){\mathtt{\,\small\textbf+\,}}\left({\mathtt{0.586}}{\mathtt{\,\times\,}}{\mathtt{x}}\right){\mathtt{\,-\,}}\left({\mathtt{3.214}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{-{\mathtt{3}}}\right)$$

This is impossible to solve since we need aat least 2 equations to work out a value for both x and y via a simultaneous equation.

True, but usually in problems like this they mean solve for y=0.

I expect poster will indicate whether that's the case here. 

 

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