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1) 3x - 5y = 7
2) 2x + 3y = 11
Despejo x en ecuación 1
3x - 5y = 7
3x = 7 + 5y
x = (7 + 5y)/3
El despeje que hice en x lo sustituyo en ecuación 2
2x + 3y = 11
2 (7 + 5y)/3 + 3y = 11
2 (5y + 7) + 3 * 3y
------------------------ = 11
3
10y + 14 + 9y = 11 (3)
19y + 14 = 33
19y = 33 - 14
19y = 19
y = 19/19
y = 1
El valor de y lo sustituyo en el despeje de x
x = (7 + 5y)/3
x = (7 + 5 (1))/3
x = (7 + 5)/3
x = 12/3
x = 4
Solución :
x = 4
y = 1