For f(x,y)=x²-xy + y² - 5x+y find all values of x and y such that f(x,y) - f(x,y)0 simultaneously. a. x = 4, y = 2 b. x= 3; y = 1 c. x = 5, y = 1 x = 7, y = 3 d. e. x = 2; y = 0

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