Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Matrix math equation help?
I need help figuring out how to solve this equation. I need help going through the steps to solve future problems. If you can, give me the steps so I can figure out the rest of the problems.
[3x+2] = [ 23 ]
[ 15 ] [-4y-1]*
*Its supposed to be one set of brackets on each side of the equal sign, so the 3x+2 and 15 are supposed to be in the same bracket and the 23 and -4y-1 are supposed to be in the same bracket.
1 Answer
- DukeLv 61 decade agoFavorite Answer
If I understand you correctly, on the left side you have a matrix of 2 rows and one column; row 1 has the entry 3x+2 and row 2 has the entry 15. On the left you have a matrix of the same size with the row 1 entry = 23 and the row 2 entry = -4y-1.
The key point is that 2 matrices are equal if their corresponding entries are equal. So if the matrix on the left side equals the one on the right, then the row 1 column 1 entry of the matrix on the left must equal the row 1 column 1 entry of the matrix on the right.Similarly, the row 2 column 1 entries of the 2 matrices must be equal.
So we have: 3x+2 = 23, and 15 = -4y-1.
Solving yields x = 7 and y = -4.
