Question #258646

X+Y-Z=4

2X+Z=7

3X-2Y=5


1
Expert's answer
2021-11-01T17:12:07-0400

Let we solve the sysyem by using Gauss method:

(111=4201=7320=5)\begin{pmatrix} 1 & 1 &-1&=&4\\ 2 & 0 & 1&=&7\\ 3& -2& 0&=&5 \end{pmatrix}

1) Add 2 equation to the1 equation

(310=11201=7320=5)\begin{pmatrix} 3 & 1 &0&=&11\\ 2 & 0 & 1&=&7\\ 3& -2& 0&=&5 \end{pmatrix}

2) We add 1 equation multiplied by 2 to to the 3 equation:

(310=4201=7900=27)\begin{pmatrix} 3 & 1 &0&=&4\\ 2 & 0 & 1&=&7\\ 9& 0& 0&=&27 \end{pmatrix}

3) Divide 3 eqution by 9

(310=11201=7100=279=3)\begin{pmatrix} 3 & 1 &0&=&11\\ 2 & 0 & 1&=&7\\ 1& 0& 0&=&\frac{27}{9}=3 \end{pmatrix}

4) Substract from 1 equation 3 equation multiplied by 3 and fron 2 equation 3 equation multiplied by 2

(010=1133=2001=723=1100=3)\begin{pmatrix} 0 & 1 &0&=&11-3\cdot 3=2\\ 0 & 0 & 1&=&7-2\cdot 3=1\\ 1& 0& 0&=&3 \end{pmatrix}

Matrix to the left is unit now then problem is solved.

Answer:

X=3Y=2Z=1X=3\\ Y=2\\ Z=1


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!
LATEST TUTORIALS
APPROVED BY CLIENTS