For anyone who is watching 6/2024 and after. There is a typo for his det y it is supposed to be -.102 and the y value after doing your division is supposed to be .226. [y=(det y)/det]. I've checked Chegg and the back of my book; his answer is correct. I can only assume that the matrices are done correctly and that there are no issues with the negatives. His answer is 1556 and the answer is 1558 but that's a rounding error.
To go about the matrices step with a graphing calculator (I use TI-84 Plus), create a 3X4 matrix (2ND>x¯¹) with the last column being 0; 0; 1. Then use the operation rref( with the corresponding matrix letter to get your final answers.
I HIGHLY recommend doing this for this problem, makes it so much faster, watch this guy walk you through the steps, th-cam.com/video/zhypLK9nK80/w-d-xo.html Key thing here is the first row is whatever you put into the first column, 2nd row is whatever you put into the 2nd column and so on. I hope this helps
In the last determinant for det Y did you forget to add the negatives to the bottom numbers like you did in the other two? Also the calculations for the last Y is wrong. -.265/.451 I think.
For anyone who is watching 6/2024 and after. There is a typo for his det y it is supposed to be -.102 and the y value after doing your division is supposed to be .226. [y=(det y)/det]. I've checked Chegg and the back of my book; his answer is correct. I can only assume that the matrices are done correctly and that there are no issues with the negatives. His answer is 1556 and the answer is 1558 but that's a rounding error.
To go about the matrices step with a graphing calculator (I use TI-84 Plus), create a 3X4 matrix (2ND>x¯¹) with the last column being 0; 0; 1. Then use the operation rref( with the corresponding matrix letter to get your final answers.
I HIGHLY recommend doing this for this problem, makes it so much faster, watch this guy walk you through the steps, th-cam.com/video/zhypLK9nK80/w-d-xo.html Key thing here is the first row is whatever you put into the first column, 2nd row is whatever you put into the 2nd column and so on. I hope this helps
Thank you so much for these videos. I appreciate your explanations SO much!
u can use the ti-84 for the matrices part really simple save about 6 min of work
yeah is just that some of us weren't allowed to use programmable calculators :(
How? I didn't think the 84 could output an undefined variable. What are you using as a placeholder for F?
How did you do it?
why did the Det y came out as .226 F? i cant seem to find .226 F with my own calculation
you probably should have just gone over how to do this on a calc, this is a ton of work.
In the last determinant for det Y did you forget to add the negatives to the bottom numbers like you did in the other two? Also the calculations for the last Y is wrong. -.265/.451 I think.
There is an error in (y), you are not dividing by main determinant. Real result for y is = -.502 F
did you forget the negatives when you did the first matrix for .857 .885 .857
Thank you Dax
Dety is wrong please go through the steps on how you found that
Thank you sooooooo much you are a life saver, do you have a channel for thermo-fluid sciences??
det y is wrong should be -0.501
Did you use cramer's rule?
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