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
goldenfox [79]
3 years ago
9

X+2y=-1 and 4x-4y=20 solve by substitution

Mathematics
1 answer:
Illusion [34]3 years ago
8 0

To do this problem you would first need to factor out a variable, which in this case I would want to do the first equation because it is isolated. Now the equations would look like this:

x = -2y - 1

4x - 4y = 20

Since we know that x is now equal to -2y - 1 we can plug it in to the x value in the second equation:

4 (-2y -1) - 4y = 20

-8y -4 - 4y

-12y - 4 = 20

-12y = 24

y = -2

Now that we know the y value plug the y value to one equation to find the x, I will be using the first equation

x + 2(-2) = -1

x - 4 = -1

x = 3

Solutions:

y = -2

x = 3

You might be interested in
Can someone please help me with this question?
Vanyuwa [196]

Answer:

5 seconds

Step-by-step explanation:

In 5 seconds it will be at 98 meters

x = -b/2a

x = -20/2(-2) = -20/-4 = 5

8 0
2 years ago
What is true about a function?
mars1129 [50]

Answer: Your answer is the third one, a function assigns to each input exactly one output.

If you have a true function, there will only be one output for each input, if you had more than one, it isn't a function.


6 0
3 years ago
Read 2 more answers
Please hurry in need for help!!
d1i1m1o1n [39]

5 × x = 1/4        x = 1/4 ÷ 5        x = 1/20

7 0
2 years ago
What is the constant proportionality of this problem
GaryK [48]
You did not include the problem therefore i cannot help you with this but if you could message me the problem i’d be happy too
8 0
3 years ago
Read 2 more answers
Whats the answer to #10. use the blue thing.
zvonat [6]
It is 784 cubic inches so you are right

4 0
3 years ago
Read 2 more answers
Other questions:
  • Write 87.5% as a fraction in simplest form
    9·1 answer
  • How to slove step by step
    6·1 answer
  • Martell had boxes he was stacking.Each was 2 feet high.If he stacks 3 boxes on top of a table that is 3 feet high,what will be t
    5·2 answers
  • What is the value of x?
    13·2 answers
  • Kevin says that lines p and m will eventually intersect.
    13·2 answers
  • Please help ASAP !<br> Please help ASAP !
    13·2 answers
  • F(x) = log10 (x) + 5
    11·1 answer
  • I needdd help please! ):
    10·1 answer
  • Find the measure of angle QPR.<br> Given<br> m m m Find m
    7·1 answer
  • Someone pls help me with these worksheets :&lt;
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!