For what value of x will the lines l and m be parallel to each other?
Question:
For what value of $x$ will the lines / and $m$ be parallel to each other?
Solution:
$\Leftrightarrow 3 x+5+4 x=180$ [Consecutive Interior Angles]
$\Leftrightarrow 7 x=175$
$\Leftrightarrow x=25$