How do you write the equation of the line given the slope and the y-intercept. m = 2, y-intercept (0, 3)?

$y = 2 x + 3$
$y = m x + c$
where $m \implies s l o p e$ and $c \implies$ value of $y$ in y-intercept
Given that $m = 2$ and $y$ intercept is $\left(0 , 3\right)$, you just chug in the values to get what's asked for.