Do the three lines 2x1 + 4x2 + 4x3 = 4, x2 - 2x3 = -2, and 2x1 + 3x2 = 0 have at least one common point of intersection? It's linear algebra, and has to do with determining the consistency of systems. Like a matrices problem, the 1 2 and 3 represent rows, not exponents.

Question

rvc · Answer

do you know matrices?

tkhunny · Answer

Have you considered a determinant?

anonymous · Answer

Hi rvc, I know a little about matrices since we just started going over them, but this one has thrown me for a loop.

rvc · Answer

equations are consistent if the determinant equals to zero

rvc · Answer

hello :)

anonymous · Answer

Okay, so how do I make that happen? I was sick and missed the lecture, so I'm a bit lost. I sorry for bothering you. -_-;

rvc · Answer

do you remember how to find determinant?

anonymous · Answer

No, not really. I'm sorry.

anonymous · Answer

I missed it. How do I find the determinant?

rvc · Answer

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