Question

daca x supra y este egal cu 2 supra 3 atunci 6x+y supra 9x+y

Answer 1

$\frac{x}{y} = \frac{2}{3} = >3x = 2y \\ 6x = 2 \times 3x = 2 \times 2y = 4y \\ 9x = 3 \times 3x = 3 \times 2y = 6y \\ 6x + y = 4y + y = 5y \\ 9x + y = 6x + y = 7y \\ \frac{6x + y}{9x + y} = \frac{5y}{7y} = \frac{5}{7}$