How to draw a graph for function with constraints?

2020 7 1
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更新时间：2020 7 2
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How can I draw the contour plot of the function z = 3x + 4y and the constraint curve x^2 + 4xy +5y^2 = 10 in the same figure ?

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Matt J
Matt J 2020-7-1

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fimplicit(@(x,y) x.^2 + 4*x.*y +5*y.^2 - 10,'r'); hold on; fcontour(@(x,y) 3*x+4*y) ; hold off

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