Answer
$\color{blue}{y=3x+9}$
Work Step by Step
RECALL:
The slope-intercept form of a line's equation is:
$y=mx+b$
where $m$=slope and $b$ = y-intercept.
The line has a slope of $3$, so the tentative equation of the line is:
$y=3x+b$.
To find the value of $b$, substitute the x and y values of the given into the tentative equation above to obtain:
$y=3x+b
\\3=3(-2)+b
\\3=-6+b
\\3+6=b
\\9=b$
Therefore, the equation of line is $\color{blue}{y=3x+9}$.
