I.3x-(9xmas y)=5y-(2x mas 9y)
3x-9x-y=5y-2x-9y
3x-9x mas 2x=5y -9y mas y
-4x=-3y
4x=3y
x=(3y)/4
II.4x-(3y mas 7)=5y-47
4x-3y-7=5y-47
4x=5y-47 mas 3y mas 7
4x=8y-40
x=(8y-40)/4
Igualación:
(3y)/4=(8y-40)/4 |por 4
3y=8y-40 |sumamos 40
3y mas 40=8y |restamos 3y
40=5y |dividimos entre 5
8=y
Sustituimos y en:
I.x=(3y)/4
x=24/4
x=6
Respuesta:
x=6 |y=8
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I.3x-(9xmas y)=5y-(2x mas 9y)
3x-9x-y=5y-2x-9y
3x-9x mas 2x=5y -9y mas y
-4x=-3y
4x=3y
x=(3y)/4
II.4x-(3y mas 7)=5y-47
4x-3y-7=5y-47
4x=5y-47 mas 3y mas 7
4x=8y-40
x=(8y-40)/4
Igualación:
(3y)/4=(8y-40)/4 |por 4
3y=8y-40 |sumamos 40
3y mas 40=8y |restamos 3y
40=5y |dividimos entre 5
8=y
Sustituimos y en:
I.x=(3y)/4
x=24/4
x=6
Respuesta:
x=6 |y=8