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14-11-2014
Mathematics

contestada

2x—y=7
Y=0.5x+17

0.2x+y=-1.8
Y—5x=6

4x—5y=14
-4x+4=-6

Respuesta :

15-11-2014

1.
2x-y=7
y=0.5x+17

y=-7+2x

0,5x+17=2x-7
-1,5x=-24
x=16

2.
0.2x+y=-1.8
Y—5x=6

y=6+5x

0.2x+y=-1.8
0,2x+6+5x=-1,8
5,2x=-7,8 /: (5,2)
x=1,5

3.
4x—5y=14} +
-4x+4[y]=-6

4x-5y -4x+4y=14+6
-y=20
y=-20

4x-5y=14
4x= 14 +5 (-1)
4x=9
x=2,25

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