Question

Ajutor !! Exercițiul din imagine !!

Answer 1

e ok eu asa cred sper

Answer 2

[tex]a)\frac{7x+3y}{5x+6y}=\frac{4}{5}\\ 5(7x+3y)=4(5x+6y)\\ 35x+15y=20x+24y\\ 35x-20x=24y-15y\\ 15x=9y|:3\\ 5x=3y\\ b)5x=3y \Rightarrow x=\frac{3y}{5} \Rightarrow \frac{x}{y}=\frac{3}{5} \Rightarrow \\ \Rightarrow \frac{x}{3}=\frac{y}{5}=k \Rightarrow x=3k,y=5k\\ \frac{5x+8y}{7x+9y}=\frac{15k+40k}{21k+45k}=\frac{45k}{66k}=\frac{15}{22}[/tex]