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Rezolvati ecuatiile in multimea N si multimea Z
3x-4=6-x
1-8x=x-5
3+y=-2y-60


Răspuns :

3x-4=6-x |+x
4x-4=6 |+4
4x=10 |:4
x= 10 supra 4 = 5 supra 2 = 2,5

1-8x=x-5 |+5
6-8x=x |+8x
6=9x |:9
x=6 supra 9 = 2 supra 3

3+y=-2y-60 |+60
63+y=-2y |+2y
63+3y=0 |-3y
63 = -3y |:3
-y= 63 supra 3 = 31
-y= 31 => y = -31