Explicación paso a paso:
[tex]3x - y = 5 \\ y = 7 - x \\ 3x - (7 - x) = 5 \\ 3x - 7 + x = 5 \\ 4x - 7 = 5 \\ 4x = 5 + 7 \\ 4x = 12 \\ x = \frac{12}{4} = 3 \\ y = 7 - 3 = 4 \\ 3 \times 3 - 4 = 9 - 4 = 5[/tex]
CS (5,3)
espero te sirva
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Explicación paso a paso:
[tex]3x - y = 5 \\ y = 7 - x \\ 3x - (7 - x) = 5 \\ 3x - 7 + x = 5 \\ 4x - 7 = 5 \\ 4x = 5 + 7 \\ 4x = 12 \\ x = \frac{12}{4} = 3 \\ y = 7 - 3 = 4 \\ 3 \times 3 - 4 = 9 - 4 = 5[/tex]
CS (5,3)
espero te sirva