¿problemas metodo de sustitucion? 10 puntos 5 estrellas?
ayudenme tengo muchisima tarea que hacer de quimica y calculo pero no tengo tiempo porque matematicas es mañana
2x + 5y =19
3x - 4y = -6
5x - 3y = -7
3x + 5y = -11
2x + 3y =1
3x + 2y =4
3(x + y) =2y + 1)
2(x -y) -1 =5
reducir los parentesis
es para mañana viernes ayudenme de evrdad se los agradeceria :D
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2x + 5y =19
3x - 4y = -6
2x + 5y =19
5y=19-2x
y=(19-2x)/5 ----------> y=(19-2*2)/5= 3
3x -4[(19-2x)/5]= -6
3x - 76/5 + 8x/5= -6
23x/5= 46/5
x=2
Resp: x=2 ; y=3
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5x - 3y = -7
3x + 5y = -11
5x - 3y = -7
5x= -7+3y
x= (-7+3y)/5 ------------> x=(-7+3*-1)/5= -2
3[(-7+3y)/5] + 5y= -11
-21/5 + 9y/5 + 5y= -11
34y/5= -34/5
y= -1
Resp: x= -2 ; y= -1
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2x + 3y =1
3x + 2y =4
2x + 3y =1
2x=1 - 3y
x= (1 - 3y)/2 ------------> x= (1 - 3*-1)/2= 2
3[(1 - 3y)/2] + 2y =4
3/2 - 9y/2 + 2y= 4
-5y/2= 5/2
y= -1
Resp: x= 2 ; y= -1
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3(x + y) =2y + 1
2(x -y) -1 =5
3(x + y) =2y + 1
3x + 3y= 2y +1
3x= -y+1
x= (-y+1)/3 -------------> x= (5/4+1)/3= 3/4
2{[(-y+1)/3] - y} - 1= 5
2[-y/3 + 1/3 - y] -1 =5
2[-4y/3 + 1/3] -1 =5
-8y/3 + 2/3 - 1= 5
-8y/3= 10/3
y= -5/4
Resp: x= 3/4 ; y= -5/4
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Espero que te sirva!!!!!!!!!!!
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