October 2018 1 23 Report
Quien me ayuda por favor hacer estos ejercicios por sustitucion:
a)8x+3y:30
5x-3y:9

B)9x+5y:83
4x+5y:48

c)13x-9y:50
10x+9y:26

D)3x+5y:28
4x-3y:18

e)16x-5y:125
7x-4y:42
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