Answer
see graph below
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Work Step by Step
See p. 602, Graphing Complex Numbers
The complex plane is determined by the real axis and the imaginary axis.
To graph the complex number a + bi, we plot the ordered pair of numbers (a,b) in this plane
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$z=1+i$
Plot $(1,1)$ in the complex plane
$2z=2(1+i)=2+2i$
Plot $(2,2)$ in the complex plane
$-z=-(1+i)=-1-i$
Plot $(-1,-1)$ in the complex plane
$\displaystyle \frac{1}{2}z=\frac{1}{2}(1+i)=\frac{1}{2}+\frac{1}{2}i$
Plot $(\displaystyle \frac{1}{2},\frac{1}{2})$ in the complex plane