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
atroni [7]
3 years ago
14

How can I solve the following system of equations: -4x + y= 6, -5x -y =21. I know I can cancel out but I don't know where or whe

re to go from there.
Mathematics
1 answer:
matrenka [14]3 years ago
7 0
-4x + y = 6
-5x - y = 21

add both of them
-9x = 27
x = -3

(-4*-3) + y = 6
-12 + y = 6
y = 18
You might be interested in
ning Attempt 1 of 3 SECTION 3 OF 4 QU Use the rule y=-x+ 7 to fill in the blank. If (1, .y) is on the graph, then y=​
Levart [38]

Answer:chili chuggen

Step-by-step explanation:

4 0
3 years ago
Please help asap 25 pts + brainliest to right/best answer
patriot [66]

Look at the picture.

<h3>Answer: d. (-3, 1)</h3>

4 0
3 years ago
Jerry wants to buy a hockey jersey the cost of the Jersey is normally $75, but it is now on sale 20% off.
77julia77 [94]
75 x .20 = 15
75 - 15 = 50
8 0
3 years ago
What number am I?
Katyanochek1 [597]

Answer:

The numbers less that 40 which have sum of digits 8 are 17, 26, 35.

Only one of those that has a factor of 7. And that is 35.

So you are 35.

Second way:

The numbers less that 40 which have a factor of 7 are 7,14,21,28,35

Only one of those which has sum of digits as 8. And that is 35.

So you are 35.

Step-by-step explanation:

3 0
2 years ago
This extreme value problem has a solution with both a maximum value and a minimum value. use lagrange multipliers to find the ex
noname [10]

L(x,y,z,\lambda)=10x+10y+2z+\lambda(5x^2+5y^2+2z^2-42)

L_x=10+10\lambda x=0\implies1+\lambda x=0

L_y=10+10\lambda y=0\implies1+\lambda y=0

L_z=2+4\lambda z=0\implies1+2\lambda z=0

L_\lambda=5x^2+5y^2+2z^2-42=0

\begin{cases}L_x=0\\L_y=0\\L_z=0\end{cases}\implies1+\lambda x=1+\lambda y=1+2\lambda z=0\implies x=y=2z

5x^2+5y^2+2z^2=5(2z)^2+5(2z)^2+2z^2=42z^2=42\implies z^2=1

z^2=1\implies z=\pm1\implies x=y=\pm2

There are two critical points, at which we have

f\left(2,2,1\right)=42\text{ (a maximum value)}

f\left(-2,-2,-1\right)=-42\text{ (a minimum value)}

3 0
3 years ago
Other questions:
  • A worksheet has an area of 48 square inches. Its perimeter is 28 inches. What are the dimensions of the worksheet?
    5·1 answer
  • 1. The square of a number, n, is equal to the sum of that number and 11. Which equation represents this relationship?
    5·1 answer
  • All bags entering a research facility are screened. Ninety-seven percent of the bags that contain forbidden material trigger an
    6·1 answer
  • What is the square root of 16?​
    6·2 answers
  • Helppo meeeee plz ty! explain plz!​
    9·2 answers
  • Combine the like terms to make a simpler expression <br> 9p+3p
    7·1 answer
  • Write a function rule for the relationship between the amount of plant food remaining, f(x), and the number of days that have pa
    14·1 answer
  • PLEASE ANSWER THE SECOND QUESTION!!!
    6·2 answers
  • Need help with this algebra question
    7·1 answer
  • Describe how to round set to the best<br> HELP PLEASE QUICKLY
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!