Mathematics: May sum1 help me? pls

Once we gotStep-by-step explanation:Given the linear system:Let s solve it using matrices. I will use Cramer s ruleConsidering determinant as D. So, we have...

May sum1 help me? pls - id110036049, carlosleblanc26

Ответ:

dylanjones6996

14.02.2022

Mathematics

126

Step-by-step explanation:

360 x 35% = 126

Since it indicates that 65% like Italian food, perhaps the other 35% like football.

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Ответ:

JussSplash1340

10.01.2020

Mathematics

Once we got

x=-1

y=3

z=2

$\boxed{\text{The sum is 4}}$

Step-by-step explanation:

Given the linear system:

$\begin{cases} 2x + 3y-z = 5 \\ x- 3y + 2z = -6 \\ 3x + y - 4z = -8 \end{cases}$

Let's solve it using matrices. I will use Cramer's rule

$M=\left[\begin{array}{ccc}2&3&-1\\1&-3&2\\3&1&-4\end{array}\right]$

Considering determinant as D.

$D=\begin{vmatrix}2&3&-1\\1&-3&2\\3&1&-4\\\end{vmatrix}=40$

$M_x = \left[\begin{array}{ccc}5&3&-1\\-6&-3&2\\-8&1&-4\end{array}\right] \implies D_x = \begin{vmatrix}5&3&-1\\-6&-3&2\\-8&1&-4\\\end{vmatrix}=-40$

$M_y = \left[\begin{array}{ccc}2&5&-1\\1&-6&2\\3&-8&-4\end{array}\right] \implies D_y = \begin{vmatrix}2&5&-1\\1&-6&2\\3&-8&-4\\\end{vmatrix}=120$

$M_z = \left[\begin{array}{ccc}2&3&5\\1&-3&-6\\3&1&-8\end{array}\right] \implies D_z= \begin{vmatrix}2&3&5\\1&-3&-6\\3&1&-8\\\end{vmatrix}=80$

So, we have

$x=\frac{D_x}{D} =\frac{-40}{40}=-1$

$y=\frac{D_y}{D} =\frac{120}{40}=3$

$z=\frac{D_z}{D} =\frac{80}{40}=2$

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May sum1 help me? pls

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