Question

aflati numerele x si y daca sunt direct proportionale cu 5 si 6 si 4x-3 y=6

Answer 1

(x;y) d.p.(5;6)
4x-3y=6
$\frac{x}{5} = \frac{y}{6} =$K ⇒
x=5K
y=6K
4×5K-3×6K=6
20K-18K=6
2K=6
K=6:2
K=3
x=3×5⇒x=15
y=3×6⇒y=18

Answer 2

x/5=y/6=k 
x=5k
y=6k
4x-3y=6
4*5k-3*6k=6
20k-18k=6
2k=6
k=3
x=5*3=15
y=6*3=18