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
salantis [7]
2 years ago
7

Solve the following simultaneous equations 2x+5y=0 and 3x-4y=23

Mathematics
1 answer:
Elodia [21]2 years ago
7 0

Answer:

x = 5, y = -2

Step-by-step explanation:

2x + 5y = 0 --- Equation 1

Equation 1×3: <u>6x</u> + 15y = 0 --- Equation 2

3x - 4y = 23 --- Equation 3

Equation 3×2: <u>6x</u> - 8y = 46 --- Equation 3

<em>We will be eliminating 6x from Equation 2. </em>

Equation 3-2: 6x - 8y - 6x - 15y = 46-0

-23y = 46

y = 46 ÷ -23

<u>y = -2 </u>

Substitute y = -2 into Equation 1:

2x + 5y = 0

2x + 5(-2) = 0

2x + (-10) = 0

2x - 10 = 0

2x = 10

x = 10 ÷ 2

<u>x = 5 </u>

You might be interested in
Help me please!!!!!!
Rashid [163]
A, C, D, E . all of them are true.
5 0
2 years ago
Whats the hcf of 108 and 308​
inna [77]

Answer:

i think this should help

5 0
2 years ago
Read 2 more answers
The Taylors have recorded their weekly grocery expenses for the past 12 weeks and determined that the mean weekly expense was ​$
SVETLANKA909090 [29]

Answer:

$84.80

Step-by-step explanation:

find the difference between accurate price and written price: 74 - 47 = 27

find written total (before Mrs. Taylor found mistake) by undoing the mean calculation: 82.55 x 12 = $990.60

the total expenses is $27 more than what they thought: 990.60 + 27 = 1017.60

divide accurate total by 12 to find mean: 1017.60 / 12 = $84.80

hope this helps :)

4 0
2 years ago
You need to make 5 grilled cheese sandwiches. You have a grill that is large enough to toast 2 sandwiches at a time. The sandwic
n200080 [17]
Each sandwich is toasted for 2 minutes and it takes 3 seconds to flip it.
The first two sandwiches will be toasted in 2 minutes (toasting) and 6 seconds (flipping).
The two will then be switched which will take 10 seconds.
The next two will again take 2 minutes and 6 seconds.
The final sandwich will take 5 seconds to be placed.
The final sandwich will also take 2 minutes to toast and 3 seconds to flip.
Total time:
2 + 2 +2 = 6 minutes
6 + 10 + 6 + 3 = 25 seconds
Total time is 6 minutes and 25 seconds.
8 0
2 years ago
Read 2 more answers
30 Points please help!! Please explain too!
sergiy2304 [10]
Initial: 200 feet = opp. side
Angle = 17.31, adj. Side = a
So tan (17.31) = opp. Side / adj. Side
tan (17.31) = 200 / a
--> a = 200/tan17.31 = 641.73
When stopped: adj. Still = a
Opp. Side still = 200, angle = 46.41
tan46.41 = 200 / a
--> a = 200/tan46.41 = 190.39
Now subtract those two distances to get the distance traveled from initial to when it stopped:
641.73 - 190.39 = 451.34 feet
3 0
2 years ago
Other questions:
  • A 220-watt microwave is used an average of two hours a day. Find the cost of using the microwave for two weeks at a cost of $0.1
    11·2 answers
  • after eating 25 percent of the pretzels, Sonya had 42 left. how many pretzel did Sonya have originally? ​
    6·1 answer
  • Other than replacing the equal sign with some sort of inequality sign, what is the one big difference we need to keep in mind wh
    8·1 answer
  • - find the volume of this cylinder <br><br> diameter = 6 cm<br> height = 11 cm
    14·1 answer
  • Please help me tysm!
    9·2 answers
  • Plz help!!!!
    10·1 answer
  • What is the answer??
    7·1 answer
  • Linear or non linear
    12·1 answer
  • Evaluate:<br><br> 16÷(2+12)2<br><br> A. 2 14/25<br><br> B. 4 1/4<br><br> C. 6 2/5<br><br> D. 8 1/4
    9·1 answer
  • Divide: 63x^4÷ 9x^2 (urgent)
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!