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What am I doing wrong? (matrix question)

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I have a matrix problem where I solve for X, the problem is 4X + A = B. I plugged my matrices into my calculator & typed 4x + a then pressed enter. Then it said error? Am I not doing this problem correctly?
Do I just subtract the 2 matrices from each other instead?
Did you define a and b?

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Yes, a and b were already defined
What is the error message?
Just says error data type, 1.quit 2. go to
  • phi
matrix X is undefined, right ? I would try: enter matrix A and matrix B find B-A divide that by 4 that should give you X
  • phi
If these are small matrices, (if all else fails) you can do this by hand B-A means subtract corresponding elements
I got this from subtracting b & a, [5 3] [4 -6] [-5 0] & then I tried to divide that by 4 & it says error
  • phi
I don't know how your calculator works with matrices, but dividing a matrix by 4 means divide each of its elements by 4 (or multiply by 0.25) the first row would be 5/4 3/4 and so on...
Im using an ti-84 plus if that helps... It usually solves my problems, I don't understand why the error message keeps popping up
But I got my answer, thank you for help once again.!
  • phi
I just looked at the manual, and it should work. It does want the 4 to be a value (not a matrix) did you try multiplying by 0.25 (just an experiment)
Yes, multiplying it by 0.25 worked. Just the 4 by itself didnt
  • phi
go figure..

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