Marinada '22

[lang=hr] Točke $A=(0,0)$ i $C=(7,7)$ nasuprotni su vrhovi kvadrata $ABCD$. Pravac $4y-3x+9=0$ siječe stranicu $\overline{AB}$ u točki $E$, a stranicu $\overline{BC}$ u točki $F$. Kolika je udaljenost točaka $E$ i $F$? [/lang] [lang=en] Points $A=(0,0)$ and $C=(7,7)$ are opposite vertices of square $ABCD$. Let $E$ be the intersection of line $4y-3x+9=0$ and side $\overline{AB}$, and $F$ be the intersection of that same line and side $\overline{BC}$. What is the distance between points $E$ and $F$? [/lang]