Question

(d1)  -5x+15y-3=0   (d2)  ax-6y+7=0  a=?   d1 II d2

Answer 1

Conditia ca cele doua drepte sa fie paralele este:


$\frac{a}{-5}= \frac{-6}{15} => 15a = (-5)*(-6) => 15a=30=>a= \frac{30}{15}=2$

$=>a=2$