How Did I Do?
Format:
• If you have more than one answer to a question, enter your
answers separated by a comma.
•
If no solution exists, enter the single character "n" (without the
quote marks).
• Give your answers in exact form (i.e. do not use decimal
approximations).
• Use * to explicitly indicate multiplication between variables and
other variables, between variables and brackets, or between
sets of brackets (e.g. x*y rather than xy; 2*(x+y) rather than
2(x+y)).
Here is a system of two linear equations with two unknown constants a and
b.
25 a y+ 6 x=2
16-a-x+6y=7.b
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a. Write down the matrix of coefficients and the
augmented matrix, and put both into echelon form.
Which statement is true about the rank of the two
matrices?
The rank of both matrices is always 2,/nb. Match the graphs to the cases:
No
solutions
1.
-2
Exactly one
solution
ע
-1
4
-2-
-4
--
1
Fig: 1
Fig: 2