2 years ago

How many elements are in a 9 x 3 matrix?

Mathematics

1 answer:

Fantom [35]2 years ago

5 0

9x3 matrix has 9 rows and 3 columns, so it has 27 elements

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Four glasses of milk and 3 snack bars have a total of 93 carbs, and 2 glasses of milk and 4 snack bars have a total of 74 carbs.

Sedbober [7]

Ok... we'll do the same here, elimination

g = carbs in one glass of milk
b = carbs in a snack bar

$\bf \begin{array}{llcll}
4g+3b=93&\implies &4g+3b=93\\
2g+4b=74&\boxed{-2}\implies &-4g-8b=-148\\
&&----------\\
&&0-5b=-55
\end{array}
\\\\\\
-5b=-55\implies b=\cfrac{-55}{-5}\implies \boxed{b=11}\\\\
-------------------------------\\\\
\textit{let's plug that in either, hmm the second equation}\\\\
2g+4(11)=74\implies 2g+44=74\implies 2g=74-44
\\\\\\
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in this, we can simply multiply by -2 at the bottom to get a -4g, and thus "eliminate" the g-variable

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3 years ago

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leva [86]

You probably meant 15%
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3 years ago

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AnnyKZ [126]

The answer is b .........

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Picture and info down below!

eimsori [14]

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3 years ago

How many elements are in a 9 x 3 matrix?​

How many elements are in a 9 x 3 matrix?