c)
{2x+y=5
{x-2y=5
d)
{ x+2y=1
{2x+3y=0
Soluções para a tarefa
Respondido por
1
2x + y =5
x - 2y = 5 =====> x= 5 + 2y
2( 5 + 2y) +y =5
10 + 4y + y =5
5y = 5-10
y= -1
2x + y = 5
2x -1 = 5
x = 6/2
x= 3
c) x=3 e y= -1
Respondido por
0
c) R→
y=(5-2x)
x-2(5-2x)=5
x-10-4x=5
x-4x=5+10
3x=15
x=15/3
x=5
y=5-2•5
y=5-10
y=-5
d)R→
x=(1-2y)
2(1-2y)+3y=0
2-4y+3y=0
4y+3y=0-2
7y=-2
y=-2/7
x=1/1-2/1-2/7
7-14-2
---------
7
x=7-14-2
x=5
y=(5-2x)
x-2(5-2x)=5
x-10-4x=5
x-4x=5+10
3x=15
x=15/3
x=5
y=5-2•5
y=5-10
y=-5
d)R→
x=(1-2y)
2(1-2y)+3y=0
2-4y+3y=0
4y+3y=0-2
7y=-2
y=-2/7
x=1/1-2/1-2/7
7-14-2
---------
7
x=7-14-2
x=5
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