Explicación paso a paso:
Suma de ecuaciones:
x+2y=12 +
2x+y=9
________
3x + 3y = 21
3(x+ y) = 21
x + y = 7
Luego:
2x + y = 9 -
__________
x = 2
Entonces:
x + 2y = 12
2 + 2y = 12
2y = 10
y = 5
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Explicación paso a paso:
Suma de ecuaciones:
x+2y=12 +
2x+y=9
________
3x + 3y = 21
3(x+ y) = 21
x + y = 7
Luego:
2x + y = 9 -
x + y = 7
__________
x = 2
Entonces:
x + 2y = 12
2 + 2y = 12
2y = 10
y = 5