HP50g or other: U. of Houston calc exams

[CR Haeger]

(08-09-2015 07:46 PM)Gilles Wrote:  

(08-09-2015 07:14 PM)CR Haeger Wrote:  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

It's 'native' with the 50G (exact mode)

Code:

['2.x-3.y=6-7.a' '-3.x+5.y=7+2.a' '7.x +11.y=4-6.a' ]
['x' 'y' 'a' ]
LINSOLVE

There is a typo with x above : x = -287/128

Thanks for catching my typing error and for reminding me of the HP50G LINSOLVE command. Although the TI36x has far less functionality, its pretty efficient and required maybe half the keystrokes of the 50G on this problem.