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1.4.6,8 create a vector equation

karush

Well-known member
Jan 31, 2012
2,657
2020_05_25_18.21.28~2.jpg
#6
 

karush

Well-known member
Jan 31, 2012
2,657
$$\left[\begin{array}{rrr}
2&-3\\
3&2\\
8&-5\\
-2&1
\end{array}\right]
\left[\begin{array}{rrr}
-3\\5
\end{array}\right]
=\left[\begin{array}{rrrrr}
-21\\1\\-49\\11
\end{array}\right]$$
do they want $x_1[ ]+x_2[ ]+x_3[ ]+x_4[ ]$
cant seen to find example for this
 

karush

Well-known member
Jan 31, 2012
2,657
$$\left[\begin{array}{rl}
2\cdot (-3)&+(-3)\cdot 5\\
3\cdot (-3)&+2\cdot 5\\
8\cdot (-3)&+(-5)\cdot 5\\
-2\cdot (-3)&+1\cdot 5
\end{array}\right ]
=\left[\begin{array}{rl}
-6&-15\\
-9&+10\\
-24&+25\\
6&+5
\end{array}\right]$$
 

karush

Well-known member
Jan 31, 2012
2,657
or
$$-3\left[\begin{array}{r}
2\\3\\8\\-2
\end{array}\right]
+5\left[\begin{array}{r}
-3\\2\\-5\\1
\end{array}\right]
=\left[\begin{array}{rrrrr}
-21\\1\\-49\\11
\end{array}\right]
$$
 

karush

Well-known member
Jan 31, 2012
2,657
08.png
ok this is #8 which I did in Overleaf with Macros assume we don't try to solve for $z_? $
just curious can this be ploted on demos?
 
Last edited: