Despejamos a y:
3x-y=12
3x - 12 = y
Sustituimos:
2x+5y=25
2x + 5(3x-12) = 25
2x + 15x - 60 = 25
17x - 60 = 25
17x = 25 + 60
17x = 85
x = 85 / 17
x = 5
y = 3(5) - 12 = 15 - 12
y = 3
Despejamos a x:
x+y=50
x = 50 - y
2x+4y=134
2(50 - y) + 4y = 134
100 - 2y + 4y = 134
100 + 2y = 134
2y = 134 - 100
2y = 34
y = 34 / 2
y = 17
x = 50 - 17
x = 33
Espero te sirva de ayuda!
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Despejamos a y:
3x-y=12
3x - 12 = y
Sustituimos:
2x+5y=25
2x + 5(3x-12) = 25
2x + 15x - 60 = 25
17x - 60 = 25
17x = 25 + 60
17x = 85
x = 85 / 17
x = 5
y = 3(5) - 12 = 15 - 12
y = 3
Despejamos a x:
x+y=50
x = 50 - y
Sustituimos:
2x+4y=134
2(50 - y) + 4y = 134
100 - 2y + 4y = 134
100 + 2y = 134
2y = 134 - 100
2y = 34
y = 34 / 2
y = 17
x = 50 - 17
x = 33
Espero te sirva de ayuda!