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im having trouble with sketching a level curve

ex. equation: f(x,y) = x^2 + 2y^2

i cant run it .. (edit: sorry, -cant run it by matlab) .. :(

cant solve cant graph cant all .... in short, cant any attempt at a solution :(((

thank for your help ..

ex. equation: f(x,y) = x^2 + 2y^2

i cant run it .. (edit: sorry, -cant run it by matlab) .. :(

cant solve cant graph cant all .... in short, cant any attempt at a solution :(((

thank for your help ..

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