Question

Cele 2 exercitii. Va rog mult!Este urgent!!!Dau coroana celui care rezolva exercitiul!Va multumesc!!!

Answer 1

3x+2y=7
5x-y=2 /·2

----------------

3x+2y=7
10x-2y=4
--------------- (+)

13x=11
x=11/13

3· 11/13 + 2y= 7
33/13+2y=7
2y=7-33/13
2y=(91-33)/13
2y= 58/13
y=58/26
y=29/13


b) 2x+y=1 /·2
x-2y=-1
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4x+2y=2
x-2y=-1
-----------------(+)
5x=1
x=1/5

2· 1/5+y=1
2/5+y=1
y=1 -2/5
y=3/5