Explicación paso a paso:
2x + y = 19
x - y = 2
2x + y = 19. 2x + y = 19
-2. (x - y = 2). - 2x + 2y = -4
---------------------
3y = 15
y = 15/3
y = 5
x - 5 = 2
x = 2 + 5
x = 7
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Explicación paso a paso:
2x + y = 19
x - y = 2
2x + y = 19. 2x + y = 19
-2. (x - y = 2). - 2x + 2y = -4
---------------------
3y = 15
y = 15/3
y = 5
x - y = 2
x - 5 = 2
x = 2 + 5
x = 7