Question

stiind ca 7x+2y/3x+5y=2/3, aflati x/y+x​

Answer 1

$\frac{7x + 2y}{3x + 5y} = \frac{2}{3}$

facem produsul mezilor cu cel al extremilor

așadar, =>

3(7x+2y)=2(3x+5y)

21x+6y=6x+10y

21x-6x=10y-6y

15x=4y

=>

15x-4y=0