Answer
$a=b>1$, $k>0$, $l<0$
Work Step by Step
Since the graphs of $a e^{k x}$ and $b e^{l x}$ have the same vertical intercept, we know $a=b$.
Also $a=b>1$ because the vertical intercepts of $a e^{k x}$ and $b e^{l x}$ is above $e^{ x}$.
Since $ae^{k x}$ increases as $x$ increases, we know $k>0$.
Because $be^{lx}$ decreases and $b>0$, it means $l<0$.
