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3x+5y=7
5x-9y=7
-- 3x+5y=7
x=7-5y/3
Remplazas
5(7-5y/3)-9y=7
35-25y/3 - 9y=7
35-25y-27y=21
35-52y=21
14=52y
14/52=y
7/26=y
Ahora remplazas :
x=3x+5y=7
3x+5(7/26)=7
3x+35/26=7
78x+35=182
78x=147
x=147/78
x=49/26
Rpta: a