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
12345 [234]
3 years ago
15

3x - 2y + 3z = -20 4x - 3y - 2z = 7 -5x + 5y + z = 9

Mathematics
1 answer:
skelet666 [1.2K]3 years ago
8 0

Answer:

x= 4 y= 7 z= -6

Step-by-step explanation:

solve for one and you get them all

First, I got rid of the z by multiplying common factors (multiplied z by 2) and added equations 2 and 3 together after multiplying by 2

4x - 3y - 2z = 7

-10x+10y+2z= 18

-6x+7y= 25

Then multiplied z by -3 (to get rid of the z) with the original equation 3

3x - 2y + 3z = -20

15x-15y-3z= -27

18x-17y= -47

Next find common thing between the 2 equations we got and multiply it by that and combine (we can multiply first equation by 3 to get rid of the x and solve for y)

-18x+21y= 75

18x-17y= -47

y=7

Work backwards, substitute 7 into the above equation, you get x= 4 and then same for z to get z= -6

You might be interested in
Estimate the sum of 1/8 + 1/4
Alex17521 [72]
1/8+1/4=1/8+2/8=3/8
About 0.4 because 4•8=32~30
7 0
3 years ago
Read 2 more answers
Which measurement is greater 1 yard or one meter
forsale [732]
1 yard my guess hope it's right lol
3 0
3 years ago
Read 2 more answers
If 9 (x) = – 5x2 – 4x + 19 find f (–3)
Sliva [168]

Answer:

- 14

Step-by-step explanation:

f(x) =  - 5 {x}^{2}  - 4x + 19 \\ plug \: x =  - 3 \\ f( - 3) =  - 5 {( - 3)}^{2}  - 4( - 3) + 19 \\  f( - 3) =  - 5  \times 9   + 12 + 19 \\ f( - 3) =  - 45 + 31 \\ f( - 3) =  -14

7 0
3 years ago
Sofia bought a tablet that was 15 % off the regular price of $775.
Murrr4er [49]

Answer: $698.275

Step-by-step explanation:

$(775 x (85/100)) x 106/100

Put it on the calculator and the result that shows is $698.275.

3 0
3 years ago
Read 2 more answers
What is the y-intercept for the function?
Serjik [45]

Answer:

The y -intercept of a graph is the point where the graph crosses the y -axis. (Because a function must pass the vertical line test , a function can have at most one y -intercept . ) The y -intercept is often referred to with just the y -value.

Step-by-step explanation:

Y - intercept represents the position of a point on y-axis or when a line passes through y-axis, it, actually, passes through a point on y-axis. And that point is called the y intercept. It is usually represented by and as a point, it is represented as.

It's called the "y intercept" and it's the y value of the point where the line intersects the y- axis. For this line, the y-intercept is "negative 1." You can find the y-intercept by looking at the graph and seeing which point crosses the y axis. This point will always have an x coordinate of zero.

Hoped this helped! :D

7 0
3 years ago
Read 2 more answers
Other questions:
  • HELP ASSAP WITH THIS QUESTION
    5·1 answer
  • Please help me! It’s for my homework
    12·1 answer
  • A. 5x10 to the third power
    5·2 answers
  • Simplify the product using the distributive property.
    10·2 answers
  • Help me out with 1 - 8 please.
    11·1 answer
  • In ABC, angle C is a right angle. Which statement must be true
    11·1 answer
  • How did they get 72?
    11·2 answers
  • What inequality does the red graph show?
    10·2 answers
  • Find the volume of the sphere d=18
    11·1 answer
  • if kevin took 1/10 of an hour to use 1/2 of package of napkins. how many hours would it take to use 2 packages?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!