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1) 2x - 3y = 0
2) 3x + y = 11
Despejo y en 2.
3x + y = 11
y = 11 - 3x
Sustituyo y en 1.
2x - 3y = 0
2x - 3 (11 - 3x) = 0
2x - 33 + 9x = 0
2x + 9x = 33
11x = 33
x = 33/11
x = 3
El valor de x lo sustituyo en el despeje de y.
y = 11 - 3x
y = 11 - 3 (3)
y = 11 - 9
y = 2
Solución :
x = 3
y = 2