How to show that each of the following sets is many-one equivalent to $K$? [cutland 9-2.9-1]

Question

(a) {$x:x\in E_x$}

(b) {$x:\phi_x (x)=0$}

I know how to show $K≤_m$ {$x:x\in E_x$}, and $K≤_m$ {$x:\phi_x (x)=0$} by s-m-n.

But I don't know how to show that {$x:x\in E_x$}$≤_m$ $K$, and {$x:\phi_x (x)=0$}$≤_m K$