HP50g or other: U. of Houston calc exams

[Gilles]

(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