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sustituyendo en 2
4(2-y)/3=4
2-y=3
y=5
de 1
3x+5=2
x=-1
x = 2/3 - 1/3y
sustituyendo x:
4(2/3 - 1/3y) - y = 4/1*2/3 - 4/1*1/3y - y = 8/3 - 4/3y - y = 4
despejamos Y:
- 4/3y - y = - 4/3 - 3/3y = - 7/3y = 4 - 8/3 = 4/3
y = 4/3 / - 7/3 = - 12/21 = - 4/7
sustituyendo y:
3x + y = 3x + - 4/7 = 2
despejamos x:
3x = 2 + 4/7 = 14/7 + 4/7 = 18/7
x = 18/7 / 3 = 18/21 = 6/7
comprobacion:
3x + y = 2
3(6/7) + -4/7 = 18/7 - 4/7 = 14/7 = 2
4x - y - 4
4(6/7) - -4/7 = 24/7 + 4/7 = 28/7 = 4