Explicación paso a paso:
6x + 7y = 23
-5x - 7y = -18
---------------------
6x - 5x × 7y -7y = 23 - 18
x = 5
7y = 23 - 6x
y = (23 - 6x)/7
y = (23 - 6×5)/7
y = (23 - 30)/7
y = -7/7
y = -1
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Explicación paso a paso:
6x + 7y = 23
-5x - 7y = -18
---------------------
6x - 5x × 7y -7y = 23 - 18
x = 5
7y = 23 - 6x
y = (23 - 6x)/7
y = (23 - 6×5)/7
y = (23 - 30)/7
y = -7/7
y = -1