Respuesta:
2x-y = 7
x+2y = 5
Método de Igualación :
1 ) Se despeja a " y " en la ecuación " 2x-y = 7 " :
2x-y+y = 7+y
2x = 7+y
2x-7 = 7+y-7
2x -7 = y
y = 2x-7
2 ) Se despeja a " y " en la ecuación " x+2y = 5 " :
x+2y-x = 5-x
2y = 5-x
2y/2 = ( 5-x )/2
y = ( 5-x )/2
3 ) Se igualan las ecuaciones resultantes " y = 2x-7 " e " y = ( 5-x )/2 " :
2x-7 = ( 5-x )/2
2( 2x-7 ) = 2((5-x)/2)
4x-14 = 5-x
4x-14+14 = 5-x+14
4x = 19-x
4x+x = 19-x+x
5x = 19
5x/5 = 19/5
x = 19/5
4 ) Se reemplaza a " x = 19/5 " en la ecuación resultante " y = ( 5-x )/2 " :
y = ( 5 - (19/5) )/2 ; 5 = 25/5
y = ( 25/5-(19/5) )/2
y = ( (25-19)/5)/2
y = ( 6/5 )/2
2(y) = 2((6/5)/2)
2y = 6/5
5(2y) = 5(6/5)
10y = 30/5
10y = 6
10y/2 = 6/2
5y = 3
5y/5 = 3/5
y = 3/5
Comprobación :
2(19/5)-(3/5) = 7
38/5-3/5 = 7
( 38-3 )/5 = 7
35/5 = 7
7 = 7
(19/5)+2(3/5) = 5
19/5+6/5 = 5
(19+6)/5 = 5
25/5 = 5
5 = 5
R// Por ende , ( x , y ) = ( 19/5 , 3/5 ) es el conjunto solución de ese sistema 2×2 de ecuaciones lineales .
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Respuesta:
2x-y = 7
x+2y = 5
Método de Igualación :
1 ) Se despeja a " y " en la ecuación " 2x-y = 7 " :
2x-y = 7
2x-y+y = 7+y
2x = 7+y
2x-7 = 7+y-7
2x -7 = y
y = 2x-7
2 ) Se despeja a " y " en la ecuación " x+2y = 5 " :
x+2y = 5
x+2y-x = 5-x
2y = 5-x
2y/2 = ( 5-x )/2
y = ( 5-x )/2
3 ) Se igualan las ecuaciones resultantes " y = 2x-7 " e " y = ( 5-x )/2 " :
2x-7 = ( 5-x )/2
2( 2x-7 ) = 2((5-x)/2)
4x-14 = 5-x
4x-14+14 = 5-x+14
4x = 19-x
4x+x = 19-x+x
5x = 19
5x/5 = 19/5
x = 19/5
4 ) Se reemplaza a " x = 19/5 " en la ecuación resultante " y = ( 5-x )/2 " :
y = ( 5 - (19/5) )/2 ; 5 = 25/5
y = ( 25/5-(19/5) )/2
y = ( (25-19)/5)/2
y = ( 6/5 )/2
2(y) = 2((6/5)/2)
2y = 6/5
5(2y) = 5(6/5)
10y = 30/5
10y = 6
10y/2 = 6/2
5y = 3
5y/5 = 3/5
y = 3/5
Comprobación :
2(19/5)-(3/5) = 7
38/5-3/5 = 7
( 38-3 )/5 = 7
35/5 = 7
7 = 7
(19/5)+2(3/5) = 5
19/5+6/5 = 5
(19+6)/5 = 5
25/5 = 5
5 = 5
R// Por ende , ( x , y ) = ( 19/5 , 3/5 ) es el conjunto solución de ese sistema 2×2 de ecuaciones lineales .
Explicación paso a paso: