# Thread: How to solve complex number equations with a calculator?

1. ## How to solve complex number equations with a calculator?

Let x,y be in the complex plane

Say,
(1+i)x+ (2+i)y -5 = 0
(3+2i)x + (4+i) -10 = 0

I couldn't solve such a system of equations with neither of casio fx-9750g, hp 50g and TI-89..

Any help would be appreciated. Thanks in advance.

2. Hi. I never solved a system of equations like this in a math class, but I think I know how to do it on a TI 89 Titanium.

First, I have a question about your second equation. It reads $(3+2i)x + (4+i) -10 = 0$ Is there supposed to be a $y$ after the $(4+i)$? If there is, here is how to do it on a TI 89.

Then enter the coefficents of x and y like in the first screenshot, and finally hit F5 to solve. The answer screen is in the second screenshot.

If there is not supposed to be a $y$ in the second equation, you could just solve it for $x$ and then plug it in to the other equation using the substutition method. (All of this could be done on a calculator), or you could solve it as a system using the same method described above making the coefficent of y 0 and moving the term $(4+i)$ to the other side of the equation.

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# complex number equations solution using calculator

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