HP50g or other: U. of Houston calc exams

08092015, 07:14 PM
(This post was last modified: 08092015 08:22 PM by CR Haeger.)
Post: #16




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, xz 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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