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8x - 3y = 19
Despejando x de la 1era ecuación:
2x = -5y -24
x = (-5y - 24) / 2
Sustituyendo en la 2da ecuación:
8 [(-5y - 24)/2] - 3y = 19
4[-5y - 24] - 3y = 19
-20y - 96 - 3y = 19
-23y = 96 + 19
-23y = 115
y = -5
x = [-5(-5) - 24]/2
x = (25 - 24)/2
x = 1/2
x - 2y = 7
3x + y = 35
Despejando x de la 1era ecuación
x = 7 + 2y
3(7 + 2y) + y = 35
21 + 6y + y = 35
7y = 35 -21
7y = 14
y = 2
x = 7 + 2(2)
x = 3