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3 years ago

Solve each equation -8a - 1=-23

Mathematics

2 answers:

bagirrra123 [75]3 years ago

5 0

-8a/8 = 22

8 divided by 22 is 2.75

a = -2.75

gladu [14]3 years ago

5 0

$-8a-1=-23 \ \ \ \ \ |add\ 1\\\\
-8a=-22\ \ \ \ \ divide\ by\ -8\\\\
a=\frac{22}{8}=2\frac{3}{4}\\\\ Solution\ is\ a=2\frac{3}{4}.
$

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2 years ago

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morpeh [17]

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x = 57/28

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Use the application in the next link: https://www.zweigmedia.com/RealWorld/tutorialsf1/scriptpivotold.html

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$\left[\begin{array}{cccc}1&5&8&1\\3&2&2&5\\-2&-7&2&5\\\end{array}\right]$

then using the tool provided, make row operations until you find the solution:

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$\left[\begin{array}{cccc}1&0&-6/13&23/13\\0&1&22/13&-2/13\\0&3&18&7\\\end{array}\right]$

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Here you have a reduced array an therefore the answers to each variable are on each row:

$\left[\begin{array}{c}x\\y\\z\end{array}\right]$

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