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
andrezito [222]
3 years ago
12

PLEASE HELP!!!!

Mathematics
1 answer:
alina1380 [7]3 years ago
7 0

Answer:

B, D, E  

Step-by-step explanation:

-8x  -  6y = 10

  x + 7y =    9

You can multiply any of these equations by a constant without changing the solution.

B. 4x + 3y = -10 is equivalent to multiplying each side of the first equation by -½.

D. -16x - 12y = 20 is equivalent to multiplying each side of the first equation by 2.

E. 3x + 21y = 27 is equivalent to multiplying each side of the second equation by 3.

A. -2x + 7y = 9 is wrong. The signs don't match those of the second equation.

C. 24x + 18y = 10 is wrong. The signs don't match those of the first equation.

F. x - 14y = -18 is wrong. The coefficient of x should be -2.

You might be interested in
Write the words for the expression 3x(6-1)
fgiga [73]

Answer:

three <em>multipl</em><em>i</em><em>e</em><em>d</em><em> </em>by six <em>m</em><em>i</em><em>n</em><em>u</em><em>s</em><em> </em>one in <em>parentheses</em><em> </em>

Step-by-step explanation:

For the last part aka (6-1) just say that 6-1 is in parenthesis

Hope this helpss!! :DD♡

5 0
3 years ago
What is the factored form of the expression? 4x^2-81y^2
Tasya [4]
4x^2-81y^2 

(2x)^2-(9y)^2&#10; 

(2x+9y)(2x-9y)
4 0
3 years ago
Read 2 more answers
Some help figuring out the answer?? Also explain a little how you got there
ipn [44]

9514 1404 393

Answer:

  x = 10·cos(θ) -4·cot(θ)

Step-by-step explanation:

Apparently, we are to assume that the horizontal lines are parallel to each other.

The relevant trig relations are ...

  Sin = Opposite/Hypotenuse

  Cos = Adjacent/Hypotenuse

If the junction point in the middle of AB is labeled X, then we have ...

  sin(θ) = 4/BX   ⇒   BX = 4/sin(θ)

  cos(θ) = x/XA   ⇒   XA = x/cos(θ)

Then ...

  BX +XA = AB = 10

Substituting for BX and XA using the above relations, we get

  4/sin(θ) +x/cos(θ) = 10

Solving for x gives ...

  x = (10 -4/sin(θ))·cos(θ)

  x = 10·cos(θ) -4·cot(θ) . . . . . simplify

_____

We used the identity ...

   cot(θ) = cos(θ)/sin(θ)

6 0
3 years ago
2(x + 5) = 3x + 13y – 4= 6 – 2y3(n + 2) = 9(6 – n)
dezoksy [38]
42 I think I’m not really sure
6 0
3 years ago
Using the graph, what does f(8) equal?<br> PLEASE I NEED SO MUCH HELP!!
Shtirlitz [24]

Answer:

Step-by-step explanation:

The question is not terrifically worded. What it means is "What is the y value when x = 8" That's what f(8) conveys to you.

The answer (though zero is not marked and should be) is 1 unit above 0.

The answer is f(8) = 1 He's heading back.

5 0
3 years ago
Other questions:
  • HELP PLEASE ALMOST DUE
    5·2 answers
  • Can u plz add these together.
    9·1 answer
  • an athlete completed race in 55.72 seconds how many times greater is a digit in the tenths place than the digit in the ones plac
    7·1 answer
  • Consider the following quadratic equation x^2 =4x -5. How many solutions does it have?
    13·2 answers
  • The amount of money in Nadia’s savings account is represented by the recursive formula an=1.025(an-1)+50 if a6=291.51 what are t
    9·1 answer
  • Decrease £180 by 12.5%
    14·2 answers
  • 2x + 11 + 6x<br> Combing like terms
    14·2 answers
  • Which expression represents the fourth term in the binomial expansion of (e + 2f)10?
    15·2 answers
  • How can i use substraction to describe divison? <br> I’ll mark u as the brainliest
    5·1 answer
  • Solve each inequality. The variable should be on the left-hand side in your solution.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!