![X= \left[\begin{array}{ccc}-4&1\\5&-1\\\end{array}\right] \left[\begin{array}{ccc}21\\20\\\end{array}\right] \\](/tpl/images/1384/7192/1d8bd.png)
![A=\left[\begin{array}{ccc}1&1\\5&4\\\end{array}\right] \\\\|A| = 1(4)- 5(1)\\|A| = 4-5\\|A| = -1\\A^{-1} = -\left[\begin{array}{ccc}4&-1\\-5&1\\\end{array}\right] \\\\A^{-1} = \left[\begin{array}{ccc}-4&1\\5&-1\\\end{array}\right] \\](/tpl/images/1384/7192/3ba6e.png)
PLZZ HELPPP
Which matrix equation can be used to solve the system?
x+y=21
5x...
Mathematics, 27.06.2021 09:00 dulcejuarez2005
PLZZ HELPPP
Which matrix equation can be used to solve the system?
x+y=21
5x+4y=20
Answers: 3
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