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
Valentin [98]
3 years ago
15

Which of these strategies would eliminate a variable

Mathematics
2 answers:
sdas [7]3 years ago
8 0

Answer:

Multiply the first equation by 3

Multiply the second equation by -7

Step-by-step explanation:

After doing the above method, you will derive equation 3 and 4 then you can eliminate the x and get y .

FURTHER EXPLANATION

-7x + 2y = 5 -------(1)\\3x - 5y = -5-------(2)\\\\-7x + 2y = 5 -------(1) \times 3\\3x - 5y = -5-------(2)\times-7\\\\-21x +6y=15 -----(3)\\-21x +35y=35----(4)\\Subtract -eq- 4- from -eq- 3 \\-29y =-20\\Divide-both-sides-by;-29\\\frac{-29y}{-29} =\frac{-20}{-29} \\y = 20/29\\

Substitute ; 20/29 for  y- in- eq 1\\-7x + 2y = 5----(1)\\-7x +2(20/29) = 5\\-7x +40/29=5\\-7x = 5 - 40/29\\-7x = 105/29\\Divide through by -7\\x = -15/29

I Hope It helps

katen-ka-za [31]3 years ago
7 0

Answer:

Multiply the first equation by 3

Multiply the second equation by -7

Step-by-step explanation:

( - 7x + 2y = 5) \times 3 \\ (3x - 5y =  - 5) \times 7

- 21x + 6y = 15 ..(3)\\  - 21x - 35y =  - 35...(4)

Subtract equation 3 from equation 4

- 21x - ( - 21x) =  - 21x + 21x = 0

x has been eliminated

You might be interested in
Any Netflix suggestions to watch?​
-Dominant- [34]

Answer:

stranger things

Step-by-step explanation:

6 0
3 years ago
What are three equivalent ratios to 2/20??
DiKsa [7]
2/20 = 1/10 = 3/30 = 4/40

so 3 equivalent ratios can be 1/10 (or 1:10), 3/30 (or 3:30), 4/40 (or 4:40)
6 0
3 years ago
:
Svet_ta [14]

Answer:

$35 for each sweater

Step-by-step explanation:

First subtract the skirt $160 - $20 = $140

Then Divide to find cost of each sweater $140/4 = 35

Answer: 35

4 0
4 years ago
If any one could please help
yKpoI14uk [10]

Answer:

I believe it’s the 3rd option but I’m not completely confident

Step-by-step explanation:

who am I kidding I’m never confident lol

3 0
3 years ago
Read 2 more answers
What is i^84? a) -i b) i c) -1 d) 1
mariarad [96]

Answer:

D) 1

Step-by-step explanation:

When you start raising i to certain powers, you begin to notice a pattern.

i^1=i \\\\i^2=-1 \\\\i^3=-i \\\\i^4=1 \\\\i^5=i \\\\ i^6=-1 \\\\ i^7=-i \\\\i^8= 1

This cycle repeats forever. Since 84 is a multiple of 4, i^84 must be 1. Hope this helps!

7 0
4 years ago
Other questions:
  • Thompson and Thompson is a steel bolts manufacturing company. Their current steel bolts have a mean diameter of 131 millimeters,
    9·1 answer
  • Which of the following can also be written as a recursive sequence?
    9·2 answers
  • Besty has N quarters.You can use the expression 0.25N to find the total value of her coins in dollars.What is the value of 18 co
    7·1 answer
  • What is the square root of 8y to the 7th power
    11·2 answers
  • The ratio of boys to girls at the grammar school is 5:7. If there are 95 boys, how many girl are there? Show your work.
    7·1 answer
  • Thomas lives in an apartment complex where all the mailboxes are together in one area. The dimensions of his individual mailbox
    15·1 answer
  • Which is the definition of a line segment?
    9·1 answer
  • Form and solve an equation for x.<br> 6x +40<br> Х<br> 3x + 100
    11·1 answer
  • A law firm is going to designate associates and partners to a big new case. The daily rate charged to the client for each associ
    6·1 answer
  • How long of a chain Can Jill make by attaching a 13 3/4 inch chain to a 15 2/4 in chain?​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!