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    NationalHardAlgebra7–9

    In the system {2x+3y=12x−y=1\begin{cases} 2x + 3y = 12 \\ x - y = 1 \end{cases}, what is the value of xx?

    No sistema {2x+3y=12x−y=1\begin{cases} 2x + 3y = 12 \\ x - y = 1 \end{cases}, qual é o valor de xx?

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    Solution

    Step 1 of 4

    1. 1.From the second equation: y=x−1y = x - 1