Question: Plotting regions in R3, for Vector Calculus

Hi, Can someone please tell me how to plot the region

V={LaTeX Code: \\widehat{}r :yLaTeX Code: \\geq 0,0LaTeX Code: \\leq x+yLaTeX Code: \\leq 1,0LaTeX Code: \\leq zLaTeX Code: \\leq 2y}????

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