HP50g or other: U. of Houston calc exams
08-09-2015, 07:14 PM (This post was last modified: 08-09-2015 08:22 PM by CR Haeger.)
Post: #16
 CR Haeger Member Posts: 275 Joined: Dec 2013
RE: HP50g or other: U. of Houston calc exams
Here is how I worked this problem:

19. Give the value of "a" for which the system below has a solution (Calculator Exam – 2015)
2x -3y = 6 - 7a
-3x + 5y = 7+ 2a
7x +11y = 4 - 6a

Rearranged to a 3x3 linear system

2x -3y +7a = 6
-3x + 5y -2a = 7
7x +11y +6a= 4

I used a TI36x [sys solv] and obtained

x = -287/128 (corrected the sign)
y = 101/128
a = 235/128 shown as z in output

To check, used [matrix] to create [3x3 coeff] and [3x1, x-z coeff] matrices then multiplied them, giving [6 7 4] 1x3 array.

These exam questions are interesting to try to solve on the TI36x.
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 Messages In This Thread HP50g or other: U. of Houston calc exams - Peter Murphy - 08-05-2015, 04:58 AM RE: HP50g or other: U. of Houston calc exams - Brad Barton - 08-05-2015, 06:40 PM RE: HP50g or other: U. of Houston calc exams - Joe Horn - 08-06-2015, 09:31 AM RE: HP50g or other: U. of Houston calc exams - Peter Murphy - 08-05-2015, 07:06 PM RE: HP50g or other: U. of Houston calc exams - Gilles - 08-05-2015, 07:13 PM RE: HP50g or other: U. of Houston calc exams - Peter Murphy - 08-05-2015, 11:34 PM RE: HP50g or other: U. of Houston calc exams - Peter Murphy - 08-06-2015, 03:33 PM RE: HP50g or other: U. of Houston calc exams - Jlouis - 08-06-2015, 09:31 PM RE: HP50g or other: U. of Houston calc exams - Peter Murphy - 08-08-2015, 06:00 PM RE: HP50g or other: U. of Houston calc exams - DavidM - 08-09-2015, 12:46 AM RE: HP50g or other: U. of Houston calc exams - Hlib - 08-08-2015, 10:19 PM RE: HP50g or other: U. of Houston calc exams - Gilles - 08-08-2015, 10:52 PM RE: HP50g or other: U. of Houston calc exams - Didier Lachieze - 08-09-2015, 01:10 AM RE: HP50g or other: U. of Houston calc exams - Peter Murphy - 08-09-2015, 02:18 AM RE: HP50g or other: U. of Houston calc exams - Hlib - 08-09-2015, 04:49 PM RE: HP50g or other: U. of Houston calc exams - CR Haeger - 08-09-2015 07:14 PM RE: HP50g or other: U. of Houston calc exams - Gilles - 08-09-2015, 07:46 PM RE: HP50g or other: U. of Houston calc exams - CR Haeger - 08-09-2015, 08:18 PM RE: HP50g or other: U. of Houston calc exams - Hlib - 08-09-2015, 10:28 PM RE: HP50g or other: U. of Houston calc exams - CR Haeger - 08-10-2015, 12:07 AM RE: HP50g or other: U. of Houston calc exams - Hlib - 08-10-2015, 02:12 PM RE: HP50g or other: U. of Houston calc exams - CR Haeger - 08-10-2015, 03:42 PM RE: HP50g or other: U. of Houston calc exams - Didier Lachieze - 08-10-2015, 03:50 PM RE: HP50g or other: U. of Houston calc exams - Peter Murphy - 08-12-2015, 04:22 PM RE: HP50g or other: U. of Houston calc exams - Gilles - 08-12-2015, 09:29 PM RE: HP50g or other: U. of Houston calc exams - CR Haeger - 08-12-2015, 11:21 PM RE: HP50g or other: U. of Houston calc exams - Hlib - 08-13-2015, 06:35 PM RE: HP50g or other: U. of Houston calc exams - Thomas Klemm - 08-12-2015, 05:26 PM RE: HP50g or other: U. of Houston calc exams - Thomas Klemm - 08-12-2015, 10:53 PM RE: HP50g or other: U. of Houston calc exams - Peter Murphy - 08-13-2015, 01:10 AM RE: HP50g or other: U. of Houston calc exams - Gerson W. Barbosa - 08-13-2015, 08:26 PM RE: HP50g or other: U. of Houston calc exams - CR Haeger - 08-13-2015, 11:14 PM RE: HP50g or other: U. of Houston calc exams - pier4r - 05-03-2017, 10:19 PM

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