$2.($CTFT and Properties$)(20$ pts$)($a$)$ Determine the Fourier transform Y $($j$)$ of y$($t$)=$ e j$2$tx $(3$t$6)$ in terms of the Fourier transform X$($j$)$ of x$($t$).($b$)$ Let X$($j$)$ be the Fourier transform of x$($t$).$ Determine the inverse Fourier transform y$($t$)$ in terms of x$($t$),$ given that the Fourier transform of y$($t$)$ is Y $($j$)=13$ e j$2($$2)$X$$ j $23$