Ответ:

x = 1,125

у = 1,125

Объяснение:

[tex]\left \{ {{3y+5x=9} \atop {5x-5y=0}} \right. |-\\\\8y=9\\y=\frac{9}{8} \\y=1,125\\\\3*\frac{9}{8} +5x=9\\\\5x=9-\frac{27}{8} \\\\5x=\frac{72-27}{8} \\\\5x=5,625\\\\x=\frac{5,625}{5} \\\\x=1,125[/tex]