y(t)=t∫−∞e−2(t−τ)x(τ−2)dτ
h(t)=t∫−∞e−2(t−τ)δ(τ−2)dτ
h(t)=t∫−∞e−2(t−2)δ(τ−2)dτ
h(t)=e−2(t−2)t∫−∞δ(τ−2)dτ
h(t)=e−2(t−2)u(t−2)
h(−2)=0