Question

daca 2 ori x +3y = 14 calculati n =4 x + 6 y-21

Answer 1

2x +3y = 14 |·2 ⇒ 4x +6y = 28 |-21 ⇒4 x + 6 y-21  = 7

Answer 2

 2x+y pe 3y=
x=4y
4y+y pe 3 y= 5y$\frac{5y}{3y}$3y,  5 pe 3