#### Answer

$y=3x$

#### Work Step by Step

$\bf{\text{Solution Outline:}}$
Use the Slope-Intercept Form to find the equation of the line with the following characteristics:
\begin{array}{l}\require{cancel}
m=3
\\\text{Through: }
(0,0)
.\end{array}
Express the answer in Slope-Intercept Form.
$\bf{\text{Solution Details:}}$
The given point indicates that the $y$-intercept is $0$ or $b=0.$ Using $y=mx+b$ or the Slope-Intercept Form, the equation of the line is
\begin{array}{l}\require{cancel}
y=mx+b
\\\\
y=3x+0
\\\\
y=3x
.\end{array}