Algebra2(check part 1)

posted by erin

1)Solve the matrix:[2x] [14]for x
[3y]=[12]
answer=7

2)V[3 1]
[0 2]
[-4 5].The dimensions of matrix V.
answer=3x2

3)The first row of T+U
T[4 -5 2] U[-9 6 4]
[8 -1 3] [-5 -2 3]
answer=[-5 1 6]

4)The first row of V-T.
V[3 1] T[4 -5 2]
[0 2] [8 -1 3]
[-4 5]
answer=not possible

1) Did you leave out an = sign between 2x and 14? If so, they are scalar matrics and 2x = 14, so x = 7. I have no idea what you also have 3y = 12

2. Yes, V has three row ans two columns.

3. correct
4. correct. You cannot subtract matrices of unequal dimensions.

its suppose to be
Solve the matrix:[2x] [14]for x
[3y]= [12]


well its still not posting right but the 3 is under the 2 and the 12 is under the 14

The matrix
2x..14
3y..12
is just an arrangement of 4 numbers. You have not set it equal to anything else, so I don't know what you mean by "solving" it for x. I also don't understand the meaning of your bracket symbols. Is is supposed to denote a determinant?
Because of the limited graphic capability here, and a shortage of available qualified staff, Jiskha is probably not a suitable place to get help with matrix problems.

thats the way my book has it.theyre in brackets.but that's basically the idea,could you look over my other problems for me?

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