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
Nastasia [14]
2 years ago
9

Solve the simultaneous equations 3x + y = 25 2x – y = 10

Mathematics
1 answer:
Darina [25.2K]2 years ago
4 0

Answer:

x=7 and y=4

Step-by-step explanation:

I will use the elimination method:

Since the co-efficient of both y's are the same number but different signs we add the 2 equations to eliminate the y:

3x + y =25
+     +     +

2x - y = 10

Simplify:

5x=35

Divide both sides by 5:

5x÷5=35÷5

Simplify:

x=7

Substitute this into either equation 1 or 2 ( I chose 1):

3(7) + y = 25

21 + y = 25

Subtract 21 from both sides and simplify to get y:

21+y-21=25-21

y=4

Therefore x=7 and y=4

You might be interested in
Solve for x.<br><br> x+23=−22<br><br> someone help
BaLLatris [955]

Answer:

x = - 45

Step-by-step explanation:

x+23(-23)=−22 (-23)First subtract 23 from both sides

x = - 45

7 0
2 years ago
Pls answer quickly. Thanks!
Gwar [14]

Answer:

the answer is D

Step-by-step explanation:


4 0
3 years ago
Multiply (- 9/20)(- 5/27)
-Dominant- [34]

Answer:

The answer to the question provided is \frac{1}{12}.

.

Step-by-step explanation:

☆Happy to help!

6 0
2 years ago
Read 2 more answers
The Crayola crayon company can make 2400 crayons in 4 minutes. How many crayons can they make in 15 minutes? Solve this problem
densk [106]
So, The Crayola Crayon company can make 2400 crayons in 4 minutes. In other words, every 4 minutes they can make 2400 crayons, right? So, in 15 minutes how many would they have made? Well, what we do is we divide 15 by 4 which is 3.75. Then we multiply the result, 3.75, by 2400. 3.75 * 9000. So, in 15 minutes, Crayola  would have made 900 crayons!

4/2400 = 15/x

Step 1: Cross Multiply

4/2400 = 15/x

4 * x = (15) * (2400)

4x = 36000

Step 2: Divide both sides by 2

4x/4 = 36000/2

x = 9000

The answer is, 9000!!! :D
4 0
3 years ago
(4x^4 - 14x^3 + 11) - (-14x^6 - 9x^5 - 12x^2) <br><br> Please simplify
yulyashka [42]
=<span><span><span><span><span><span>14<span>x^6</span></span>+<span>9<span>x^5</span></span></span>+<span>4<span>x^4</span></span></span>−<span>14<span>x^3</span></span></span>+<span>12<span>x^2</span></span></span>+<span>11</span></span>
4 0
3 years ago
Other questions:
  • Is the number 15 prime or composite?
    8·1 answer
  • Somebody please help! I need an answer fast!
    12·2 answers
  • A magazine has 120 pages. There are 28 full-page ads and 12 half-page ads. The rest of the magazine consists of articles.
    14·2 answers
  • Find the volume of the shape​
    13·1 answer
  • What is the slope of the line that passes through the points (4, -9) and (-10, 18)?
    14·1 answer
  • What is the mean of the set of numbers? {–8, –4, –3, –11}
    10·1 answer
  • Help and yelp! Asap!
    14·2 answers
  • This needs to be turned in in 15 minutes help also can u answer both
    5·1 answer
  • What is the approximate mean of the following numbers?<br> 10, 39, 71, 39, 76, 38, 25
    5·1 answer
  • Simplify the expression so there is only one positive power for each base.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!