X+y =-1
3x-y=3
5x-y=4
2x-y=-5
Soluções para a tarefa
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1)
x+y=-1
y= -1-x
3x-y=3
3x-(-1-x)=3
3x+1+x=3
4x=2
x=2/4
x=1/2
y=-1-x
y=-1-1/2
y=-3/2
2)
5x-y=4
-y=4-5x
y=-4+5x
2x-y=-5
2x+4-5x=-5
-3x=-9
x=-9/-3
x=3
y=-4+5x
y=-4+5.3
y=-4+15
y=11
x+y=-1
y= -1-x
3x-y=3
3x-(-1-x)=3
3x+1+x=3
4x=2
x=2/4
x=1/2
y=-1-x
y=-1-1/2
y=-3/2
2)
5x-y=4
-y=4-5x
y=-4+5x
2x-y=-5
2x+4-5x=-5
-3x=-9
x=-9/-3
x=3
y=-4+5x
y=-4+5.3
y=-4+15
y=11
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