# How do I graph the complex number 3+4i in the complex plane?

Remember to use the horizontal axis to plot the REAL part and the vertical one to plot the coeficient of the immaginary part (the number with $i$).
So, for a general complex number, $z = a + i b$ you have the following graph:
In your case, where the number is given as: $z = 3 + 4 i$, you get: