#### Answer

$(-\infty, \dfrac{2}{3}]$
Refer to the image below for the graph.

#### Work Step by Step

Add $2x$ on both sides to obtain:
$1+6x \le 5$
Subtract $1$ on both sides to obtain:
$6x \le 4$
Divide by $6$ on both sides to obtain:
$x \le \dfrac{4}{6}
\\x \le \dfrac{2}{3}$
The solution set is the set of real numbers less than or equal to $\frac{2}{3}$.
In interval notation, the solution set is:
$(-\infty, \frac{2}{3}]$
To graph this inequality, plot a solid dot at $x=\dfrac{2}{3}$ then shade the region to its left.
(refer to the attached image in the answer part)