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# 6 \$- 0 GD . Ills///C[useIslcrabs/Desktop/QZ'kZDU)def {5 1'5 L L. QUESTION 1 (11 points) Consider the following linear system of three equations in...

6 \$- 0 GD .® Ills///C[useIslcrabs/Desktop/QZ‘kZDU)def {5 1‘5 L L.» QUESTION 1 (11 points) Consider the following linear system of three equations in three unknowns: —.CE1+3.’E2 +1123 = 1
2:61 — 2:52 '1'“ 3.73 : 3
:51 +\$2+\$3 = 4 1. (1 points) Write this system in matrix notation. That is, write it in the form
:61
A9: = b, with vector of unknowns z = 1:2 . coefﬁcient matrix A and the vector
\$3
of constants b. 2. (1 points) Calculate the determinant of A. 3. (4 points) Show how to use Cramer’s rule to solve the system, that is7 to directly
ﬁnd the values \$1,352 and \$3. a. b c
4. (5 points) Let A’1 : d.’ e f be the inverse of A. Find f.
g h 2'

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