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The derivative with respect to 'x' is 4y3 . The derivative with respect to 'y' is 12xy2 .
If you mean: -x+2y = 5 and x+y = 1 then their values are x = -1 and y = 2
5(y+1)-2y5 x y = 5y5 x 1 = 55y + 5 - 2y5y - 2y = 3y3y + 5
only when x is equal to 2
it means that x should equal 10. x + x = 20. x = 10