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ex 9 pls. e urgent! am nevoie maine

Ex 9 Pls E Urgent Am Nevoie Maine class=

Răspuns :

Myssy

a)  x+2y=24

x+y=19

x=19-y19-y+2y=24

2y-y=24-19

y=5

x=19-5

x=14

b)3x+2y=18

2x+2y=14

3x-2x+2y-2y=18-14

x=4

c) x+y+y+z=17

x+y=10

10+y+z=17

y+z=17-10

y+z=7

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