Răspuns:
[tex]a.3y=4(x-y)= > 3y=4x-4y= > 3y+4y=4x= > 7y=4x= > \frac{x}{y} =\frac{7}{4} \\\\\\b.73y=15(2x+y)= > 73y=30x+15y= > 73y-15y=30x= > 58y=30x= > \\\frac{x}{y} =\frac{58}{30}=\frac{29}{15} \\\\\\c.9*2y=4(3x-y)= > 18y=12x-4y= > 18y+4y=12x= > \frac{x}{y} =\frac{22}{12} =\frac{11}{6}[/tex]
