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
The complex conjugate of $z=a+bi$ is $\overline{z}=a-bi.$
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$z=-5+6i$
Plot $(-5,6)$ in the complex plane.
$\overline{z}=-5-2i$
Plot $(-5,-6)$ in the complex plane.