Simple Inequality help

Niko

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5) The corner points for the bounded feasible region determined by the system of inequalities:

. . . .\(\displaystyle \begin{align*}2x_1\,+\,5x_2\, &\leq\, 20\\x_1\, +\, x_2\, &\leq\, 7\\x_1,\, x_2\, &\geq\, 0\end{align*}\)

are O = (0, 0), A = (0, 4), B = (5, 2), and C = (7, 0). Find the optimal solution for the objective profit function:

. . . . .\(\displaystyle P(x)\, =\, 3x_1\, +\, 7x_2\)



Hey I've uploaded this question, all I really want to know is can i substitute x1 and x2 for x and y and get the same result? It is simply the nomenclature that's confused me.
 
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Nevermind, this was a stupid question and I figured it out myself, thanks for reading!
 
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