Respuesta:
x = 10/3 ; y = 23/9
2x+y = 7
x+3y = 11
Método de Sustitución :
1 ) Se despeja a " y " en la ecuación " x+3y = 11 " :
x+3y-x = 11-x
3y = 11-x
3y/3 = (11-x)/3
y = (11-x)/3
2 ) Se reemplaza a " y = (11-x)/3 " en la ecuación " 2x+y = 7 " :
2x+(11-x)/3 = 7
3(2x)+3(11-3x)/3 = 3(7)
6x+11-3x = 21
(6-3)x+11 = 21
3x+11 = 21
3x+11-11 = 21-11
3x = 10
3x/3 = 10/3
x = 10/3
3 ) Se sustituye " x = 10/3 " en la ecuación " x+3y = 11 " :
(10/3)+3y = 11
3(10/3)+3(3y) = 11(3)
10+9y = 33
10+9y-10 = 33-10
9y = 23
9y/9 = 23/9
y = 23/9
x = 4 ; y = - 3
2x+3y = -1
3x+4y = 0
Método de sustitución :
1 ) Se despeja " y " en la ecuación " 2x+3y = - 1 " :
2x+3y-2x = -1-2x
3y = -1-2x
3y/3 = (-1-2x)/3
y = (-1-2x)/3
2 ) Se reemplaza " y = ( -1-2x )/3 " en la ecuación " 3x+4y = 0 " :
3x+4((-1-2x)/3) = 0
3x-4-8x/3 = 0
3(3x)+3(-4-8x/3) = 3(0)
9x-4-8x = 0
(9-8)x-4 = 0
x-4 = 0
x-4+4 = 0+4
x = 4
3 ) Se sustituye " x = 4 " en la ecuación " 2x+3y = -1 " :
2(4)+3y = -1
8+3y = -1
8+3y-8 = -1-8
3y = -9
3y/3 = -9/3
y = -3
x = 1 ; y = 2
3x+2y = 7
4x-3y = -2
1 ) Se despeja a " y " en la ecuación " 4x-3y = -2 " :
-(4x-3y) = -(-2)
-4x-(-3y) = 2
-4x+3y = 2
-4x+3y+4x = 2+4x
3y = 2+4x
3y/3 = ( 2+4x )/3
y = ( 2+4x )/3
2 ) Se reemplaza " y = ( 2+4x )/3 " en la ecuación " 3x+2y = 7 " :
3x+2((2+4x)/3) = 7
3(3x)+2(3(2+4x)/3) = 3(7)
9x+2(2+4x) = 21
9x+4+8x = 21
(9+8)x+4 = 21
17x+4 = 21
17x+4-4 = 21-4
17x = 17.
17x/17 = 17/17
x = 1
3 ) Se sustituye " x = 1 " en la ecuación. " 4x-3y = -2 " :
4(1)-3y = -2
4-3y = -2
4-3y-4 = -2-4
-3y = -6
-(-3y) = -(-6)
3y = 6
3y/3 = 6/3
y = 2
x = - 1 ; y = 1
2x+3y = 1
4x-5y = -9
1 ) Se despeja a " y " en la ecuación. " 4x-5y = -9 " :
(4x/-1)+(-5y/-1) = (-9/-1)
-4x+5y = 9
-4x+5y+4x = 9+4x
5y = 9+4x
5y/5 = (9+4x)/5
y = (9+4x)/5
2 ) Se reemplaza " y = (9+4x)/5. " en la ecuación " 2x+3y = 1 " :
2x+3((9+4x)/5) = 1
5(2x)+3(5(9+4x)/5) = 5(1)
10x+3(9+4x) = 5
10x+27+12x = 5
(10+12)x+27 = 5
22x+27 = 5
22x+27-5 = 5-5
22x+22 = 0
22x+22-22 = 0-22
22x = -22
22x/22 = -22/22
x = -1
3. ) Se sustituye " x = -1 " en la ecuación " 4x-5y = -9 " :
4(-1)-5y = -9
-4-5y. = -9
-4-5y+4 = -9+4
-5y = -5
-5y/-5. = -5/-5
y = 1
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Respuesta:
x = 10/3 ; y = 23/9
2x+y = 7
x+3y = 11
Método de Sustitución :
1 ) Se despeja a " y " en la ecuación " x+3y = 11 " :
x+3y = 11
x+3y-x = 11-x
3y = 11-x
3y/3 = (11-x)/3
y = (11-x)/3
2 ) Se reemplaza a " y = (11-x)/3 " en la ecuación " 2x+y = 7 " :
2x+(11-x)/3 = 7
3(2x)+3(11-3x)/3 = 3(7)
6x+11-3x = 21
(6-3)x+11 = 21
3x+11 = 21
3x+11-11 = 21-11
3x = 10
3x/3 = 10/3
x = 10/3
3 ) Se sustituye " x = 10/3 " en la ecuación " x+3y = 11 " :
(10/3)+3y = 11
3(10/3)+3(3y) = 11(3)
10+9y = 33
10+9y-10 = 33-10
9y = 23
9y/9 = 23/9
y = 23/9
x = 4 ; y = - 3
2x+3y = -1
3x+4y = 0
Método de sustitución :
1 ) Se despeja " y " en la ecuación " 2x+3y = - 1 " :
2x+3y = -1
2x+3y-2x = -1-2x
3y = -1-2x
3y/3 = (-1-2x)/3
y = (-1-2x)/3
2 ) Se reemplaza " y = ( -1-2x )/3 " en la ecuación " 3x+4y = 0 " :
3x+4((-1-2x)/3) = 0
3x-4-8x/3 = 0
3(3x)+3(-4-8x/3) = 3(0)
9x-4-8x = 0
(9-8)x-4 = 0
x-4 = 0
x-4+4 = 0+4
x = 4
3 ) Se sustituye " x = 4 " en la ecuación " 2x+3y = -1 " :
2(4)+3y = -1
8+3y = -1
8+3y-8 = -1-8
3y = -9
3y/3 = -9/3
y = -3
x = 1 ; y = 2
3x+2y = 7
4x-3y = -2
Método de sustitución :
1 ) Se despeja a " y " en la ecuación " 4x-3y = -2 " :
4x-3y = -2
-(4x-3y) = -(-2)
-4x-(-3y) = 2
-4x+3y = 2
-4x+3y+4x = 2+4x
3y = 2+4x
3y/3 = ( 2+4x )/3
y = ( 2+4x )/3
2 ) Se reemplaza " y = ( 2+4x )/3 " en la ecuación " 3x+2y = 7 " :
3x+2((2+4x)/3) = 7
3(3x)+2(3(2+4x)/3) = 3(7)
9x+2(2+4x) = 21
9x+4+8x = 21
(9+8)x+4 = 21
17x+4 = 21
17x+4-4 = 21-4
17x = 17.
17x/17 = 17/17
x = 1
3 ) Se sustituye " x = 1 " en la ecuación. " 4x-3y = -2 " :
4(1)-3y = -2
4-3y = -2
4-3y-4 = -2-4
-3y = -6
-(-3y) = -(-6)
3y = 6
3y/3 = 6/3
y = 2
x = - 1 ; y = 1
2x+3y = 1
4x-5y = -9
Método de sustitución :
1 ) Se despeja a " y " en la ecuación. " 4x-5y = -9 " :
4x-5y = -9
(4x/-1)+(-5y/-1) = (-9/-1)
-4x+5y = 9
-4x+5y+4x = 9+4x
5y = 9+4x
5y/5 = (9+4x)/5
y = (9+4x)/5
2 ) Se reemplaza " y = (9+4x)/5. " en la ecuación " 2x+3y = 1 " :
2x+3((9+4x)/5) = 1
5(2x)+3(5(9+4x)/5) = 5(1)
10x+3(9+4x) = 5
10x+27+12x = 5
(10+12)x+27 = 5
22x+27 = 5
22x+27-5 = 5-5
22x+22 = 0
22x+22-22 = 0-22
22x = -22
22x/22 = -22/22
x = -1
3. ) Se sustituye " x = -1 " en la ecuación " 4x-5y = -9 " :
4(-1)-5y = -9
-4-5y. = -9
-4-5y+4 = -9+4
-5y = -5
-5y/-5. = -5/-5
y = 1
Explicación paso a paso: