1. ## Linear Equation help

If two lines 6x-y=-5 and ax+2y= 7 are parallel, then a equals?

2. Originally Posted by AltQQ
If two lines 6x-y=-5 and ax+2y= 7 are parallel, then a equals?

Just remember that parallel lines have equal slopes

3. Originally Posted by AltQQ
If two lines 6x-y=-5 and ax+2y= 7 are parallel, then a equals?

$y=6x-5$
$y=-\frac{a}{2}x+\frac{7}{2}$
Thus, we can say that $6=-\frac{a}{2} \implies \color{red}\boxed{a=-12}$.