Resposta:
Explicação passo a passo:
a) [ 4 x - 2y = 4
[ x - 3y = 1 isolamos o x x= 3y+1 agora substituímos na primeira
4 x - 2y = 4
4(3y+1 )-2y=4 distributiva no parênteses
12y+4-2y=4
10y=4-4 10y=0 y=0
agora aplicamos y=0 na segunda equação
x - 3y = 1
x-3(0)=1 x-0=1 x=1
x=1 y=0
*******************************************************************************************
b) [ - 2 x - 3y = - 3
[ x - 4y = - 4 x=-4 +4y
-2(-4-4y)-3y=-3
+8 -8y-3y=-3 agrupamos os semelhantes
-11y=-3-8
-11y= -11 O -11 que multiplica o y passa dividindo
y= -11/-11 y=1
calculando X x-4y=-4
x-4(1)=-4 x-4=-4 x= -4+4 x=0
x=0 y=1
***********************************************************************************
c) [ x - 3y = - 2 x= -2+3y
[ 2x - y = 1
2(-2+3y)-y=1
-4 +6y-y=1 6y-y= 1+4 5y= 5 y=5/5 y=1
Calculando X
2x-y=1 2x-1=1 2x=1+1 2x=2 x=2/2 x=1
x=1 y=1
*********************************************************************************************
d) [ 3x + y = 4 y= 4-3x
[ - 2x + 3y = 1
-2x+3y=1 -2x+3(4-3x)=1 -2x+12-9x=1
-11x+12= 1 12X= 1+11 12x=12 x=12/12 x=1
Calculando Y
3x + y = 4 3(1) +y= 4 3+y=4 y= 4-3 y=1
x= 1 y=1
********************************************************************************************
e) [ x - 5y = 0 x=5y
[ 2x + y = 11
2x + y = 11 2(5y)+y=11 10y+y=11 11y=11 y=11/11 y=1
Calculando x
2x+y=11 2x+1=11 2x= 11-1 2x=10 x=10/2 x=5
x=5 y= 1
****************************************************************************************
f) [ 2x - 4y = - 6
[ x + 3y = 2 x= 2-3y
2x - 4y = - 6 2(2-3y)-4y=-6 4-6y-4y= -6 -10y= -6-4
-10y=-10 y= -10/-10 y=1
x + 3y = 2 x+3(1)=2 x+3=2 x= 2-3 x=-1
x=-1 y= 1
**************************************************************************************
Espero ter ajudado
LUZ E PAZ
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Resposta:
Explicação passo a passo:
a) [ 4 x - 2y = 4
[ x - 3y = 1 isolamos o x x= 3y+1 agora substituímos na primeira
4 x - 2y = 4
4(3y+1 )-2y=4 distributiva no parênteses
12y+4-2y=4
10y=4-4 10y=0 y=0
agora aplicamos y=0 na segunda equação
x - 3y = 1
x-3(0)=1 x-0=1 x=1
x=1 y=0
*******************************************************************************************
b) [ - 2 x - 3y = - 3
[ x - 4y = - 4 x=-4 +4y
-2(-4-4y)-3y=-3
+8 -8y-3y=-3 agrupamos os semelhantes
-11y=-3-8
-11y= -11 O -11 que multiplica o y passa dividindo
y= -11/-11 y=1
calculando X x-4y=-4
x-4(1)=-4 x-4=-4 x= -4+4 x=0
x=0 y=1
***********************************************************************************
c) [ x - 3y = - 2 x= -2+3y
[ 2x - y = 1
2(-2+3y)-y=1
-4 +6y-y=1 6y-y= 1+4 5y= 5 y=5/5 y=1
Calculando X
2x-y=1 2x-1=1 2x=1+1 2x=2 x=2/2 x=1
x=1 y=1
*********************************************************************************************
d) [ 3x + y = 4 y= 4-3x
[ - 2x + 3y = 1
-2x+3y=1 -2x+3(4-3x)=1 -2x+12-9x=1
-11x+12= 1 12X= 1+11 12x=12 x=12/12 x=1
Calculando Y
3x + y = 4 3(1) +y= 4 3+y=4 y= 4-3 y=1
x= 1 y=1
********************************************************************************************
e) [ x - 5y = 0 x=5y
[ 2x + y = 11
2x + y = 11 2(5y)+y=11 10y+y=11 11y=11 y=11/11 y=1
Calculando x
2x+y=11 2x+1=11 2x= 11-1 2x=10 x=10/2 x=5
x=5 y= 1
****************************************************************************************
f) [ 2x - 4y = - 6
[ x + 3y = 2 x= 2-3y
2x - 4y = - 6 2(2-3y)-4y=-6 4-6y-4y= -6 -10y= -6-4
-10y=-10 y= -10/-10 y=1
Calculando x
x + 3y = 2 x+3(1)=2 x+3=2 x= 2-3 x=-1
x=-1 y= 1
**************************************************************************************
Espero ter ajudado
LUZ E PAZ