Question

$8. a) Daca \frac{x+y}{2x+y} = \frac{4}{5} ,atunci \frac{x}{y} = ?$

$b) Daca \frac{3x+4y}{2x+y} = \frac{7}{3} ,atunci \frac{x}{y} =?$

$c)Daca \frac{6x+4y}{5x+2y}= \frac{3}{2} ,atunci \frac{x}{y} =?$

$d)Daca \frac{5x-4y}{2x-y}= \frac{7}{3},2x \neq y ,atunci \frac{x}{y} =?$

Rezolvarea completa va rog frumos.

Answer 1

a) 5x+5y=8x+4y => 3x-y=0 => y= -3x/:y  => -3x/y=1 =>x/y= -3 
b) 9x+12y=14x+7y =>5x-5y=0 =>5x=5y => x=y => x/y= 1
c) 15x -12y=14x-7y =>x-5y=o => x=5y  => x/y =5