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
Drupady [299]
2 years ago
10

-2x-9y=-25 -4x-9y=-23 system with elimination

Mathematics
2 answers:
REY [17]2 years ago
4 0
Multiply the first equation by -2. It turns into 4x+18y=50 and the other one stays -4x-9y=-23. Then you "eliminate" the equations by "adding" them. Set it up like this: 
4x+18y=50
      +
-4x-9y=-23
4x-4x= 0. 18y-9y= 9y and 50-23= 27
SO: 9y= 27 and y= 3
And then you plug that in to one equation: 4x +18(3)= 50. 4x= 50-(18*3)
4x= -4, so x=-1.
Plug it back in to check! 
Hope this helps. Happy solving! :)
Sphinxa [80]2 years ago
3 0
Tyw23456 explained it quite masterfully, but here is another way to solve the system. Start by multiplying one equation by -1 so later when we add them, the like terms with variable y will be eliminated so we can solve for x:

-1(-2x - 9y = -25) <span>→ (2x + 9y = 25)</span>

Now add the equations (we can factor a -1 out of the bottom equation for a subtraction problem):

    2x + 9y = 25
- (4x + 9y = 23)
----------------------
  -2x        =    2

Now solve for x:

-2x = 2

x = -1

Now we can plug this value back into one of the original equations to solve for y:

-2(-1) - 9y = -25

2 - 9y = -25

-9y = -27

y = 3
You might be interested in
Help me please 123432323
gladu [14]

Answer: About 0.46

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
Can you explain this question please​
Rasek [7]

Answer:

B

Step-by-step explanation:

θ and B are corresponding angles

Each is in the same position ( upper right hand corner ) in its group of four angles.

3 0
2 years ago
Read 2 more answers
Solve 4q = 52
mr_godi [17]

♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

4q = 52

Divide sides by 4

\frac{4q}{4}  =  \frac{52}{4}  \\

Simplification

q = 13

♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

8 0
2 years ago
43 +62 +57 + m / 4 = 55
ahrayia [7]
The answer is .. m= -428
7 0
2 years ago
NEED HELP ASAPPPPPPP
Reika [66]
Wouldn’t it be 8 1/6....I think. Because if the product is a whole number you would just add the product to the remaining whatever. So it would all together be 8 1/6 - 1/6 = 8
6 0
3 years ago
Other questions:
  • A game box for video games is shaped like a rectangular prism what is the surface area of the game box
    14·1 answer
  • How to add 2 5/8 plus 3/8
    8·2 answers
  • The area of a circle is approximately 379.94 square inches. What is the diameter of the circle? [Use 3.14 as an approximation fo
    11·2 answers
  • HELP?
    5·2 answers
  • What is the slope of the line y = 1?
    9·2 answers
  • Tanya has ten bills in her wallet. If she has one more $5 bill than $10 bills, and two more $1 bills than $5 bills, how many of
    6·1 answer
  • What is the length of the line?<br> Choose 1 answer:
    6·1 answer
  • . If y varies directly with x when y = -4 and x = 10, determine y when x = 2. Write and equation for the direct variation and de
    5·1 answer
  • What angle is complementary to 1 ? I'll mark brainliest
    7·2 answers
  • Could someone explain this to me?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!