Excuse me, mathematics: 20×8+ 12×9=268, so if it is 20×x+ 12×y=268, how to calculate it? Would you please give me some advice? Thank you.

20×x+ 12×y=268, there are two unknowns xy, separated by an equal sign on both sides, so this is a binary linear equation.

If a binary linear equation has only one equation, there can be countless groups of real number solutions, of course, x=8 y=9 is just one of them. In order to have a unique real number solution, a binary linear equation needs two different equations to form a set of equations, so that it can be solved.

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