1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
aliina [53]
3 years ago
14

Elimination

Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
4 0
2x -  4y + 1z = 11 ⇒ 2x - 4y + 1z = 11
1x + 2y + 3z = 9   ⇒ <u>1x + 2y + 3z = 9</u>
3x         + 5z = 12       1x - 2y - 2z = 2
                                                                     1x -  2y - 2z = 2
2x -  4y + 1z = 11                                        <u>-2x + 2y - 2z = -3</u>
1x + 2y + 3z = 9   ⇒ 1x + 2y + 3z = 9                    x - 4z = 1
3x         + 5z = 12 ⇒ <u>3x         + 5z = 12</u>          x - 4z + 4z = 1 + 4z
                                 -2x + 2y - 2z = -3                         x = 1 + 4z
                                                     <u />          1 + 4z - 2y - 2z = 2<u />
                                                               1 - 2y + 4z - 2z = 2
                                                                      1 - 2y + 2z = 2
                                                                    <u>- 1                 - 1</u>   
                                                                          -2y + 2z = 1
                                                                   -2y + 2z - 2z = 1 - 2z
                                                                                  <u>-2y</u> = <u>1 - 2z</u>
                                                                                   -2        -2
                                                                                     y = -0.5 + z
                                                         x + 2(-0.5 + z) - 2z = 2
                                                            x - 1 + z - 2z + 2 = 2
                                                                         x - 1 + z = 2
                                                                         <u>  + 1       + 1</u>
                                                                              x + z = 3
                                                                         x - x + z = 3 - x
                                                                                    z = 3 - x
                                                                      
                                            
<u />
You might be interested in
A triangle shaped paper’s height is 18 cm and width is 10 cm. Find the hypotenuse of the paper.
vodomira [7]
The hypotenuse is 20.59. 10^2+18^2=C^2
7 0
3 years ago
Given the equation f(x) = (x + 3)2 – 8, fill in the blanks:
Neko [114]
Quadratic f(x) = (x -h)² +k has vertex (h, k) and axis of symmetry x=h. When k is negative, the number of real solutions is 2, because both branches of the function cross the x-axis.

In your equation, h = -3 and k = -8.

Axis of symmetry: x = -3
Vertex: (-3, -8)
Number of real solutions: 2

4 0
3 years ago
Find the mean for the following sets of numbers.14,15,20,21
Jet001 [13]
The mean of those sets of numbers are 17.5
3 0
3 years ago
Read 2 more answers
Solve each equation by completing the square : <br> NEED THIS IN 10 MINS WILL GUVE BRAINLIEST
ololo11 [35]
Can barely see the questions ! Retake a picture if you can.
8 0
3 years ago
simplify the exponential expression completely. pleeeease help me!!!!! thank you so so so much!!! *will give brainliest*
Marrrta [24]

Answer:

( C ) p5 / q4

Step-by-step explanation:

8 0
3 years ago
Other questions:
  • Zak is 6 years older than half his sister bellas age bella is 6 years old
    11·1 answer
  • How to find the new interquartile range of the numbers 9,10,11,12,16,20,20
    7·2 answers
  • It has been decided that 100 people need to be surveyed to decide the publics opinion on a school building project. A student su
    7·1 answer
  • 1/2x-6=-6+1/2x solve and show work plss :))
    8·1 answer
  • PLEASEEEE HELLLPPPPP
    8·1 answer
  • Write each expression in exponential form 2 x 2 x 2 x 2 =
    7·2 answers
  • Plssssssssss help meeeeeeeeeeeeeeeee plssssssssss
    5·2 answers
  • What type of triangle is this?<br> A. Right<br> B. Equilateral <br> C. Isosceles <br> D. Scalene
    8·2 answers
  • The cone to the right has a height of 11 in. and a volume of
    14·1 answer
  • I needs help with it please ​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!