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
Leya [2.2K]
2 years ago
10

Solve the equations 3x + 5y = 21 -20x + 5y show your work

Mathematics
1 answer:
Digiron [165]2 years ago
8 0

Answer:

x=21/23

Step-by-step explanation:

Solve for x:

3x+5y=21−20x+5y

Add 20x to both sides:

3x+5y+20x=−20x+5y+21+20x

23x+5y=5y+21

Subtract 5y to both sides:

23x+5y+−5y=5y+21+−5y

23x=21

Divide both sides by 23:

x=21/23

You might be interested in
A + 3 + 2a = -1 + 3a + 4
Verdich [7]

Answer:The answer is Equal.

Step-by-step explanation:First you need to add A and 2A together. that equals 3a. Since 3 is left , it could be -1 and 4 because it would equal the same thing hope this helped :)

8 0
3 years ago
The perimeter of a rectangular painting is 304 centimeters. If the length of the painting is 85 centimeters, what is its width?
Brums [2.3K]

Answer:

3.58

Step-by-step explanation:

You have to divide 304 by 85

you will get 3.57647058824

You have to round it to the nearest hundedth which will leave you with 3.57

4 0
2 years ago
Kevin weighs himself and discovers he weighs 78,900 grams. How many kilograms does Kevin weigh?
faltersainse [42]

Answer:

He would weigh 78.9 kilograms. hope this helps.

3 0
3 years ago
W(t) = 3t – 1; t = 5
son4ous [18]
I’m not sure if your asking for the solution, but Hope this helps!

8 0
3 years ago
Use the work shown to find the solutions of the quadratic equation. x2 – x –3/4=0 x2 – x = 3/4
bija089 [108]

Answer:

x = - \frac{1}{2}, x = \frac{3}{2}

Step-by-step explanation:

Given

x² - x - \frac{3}{4} = 0

Multiply through by 4 to clear the fraction

4x² - 4x - 3 = 0

Consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term

product = 4 × - 3 = - 12 and sum = - 4

The factors are + 2 and - 6

Use these factors to split the x- term

4x² + 2x - 6x - 3 = 0 ( factor the first/second and third/fourth terms )

2x(2x + 1) - 3(2x + 1) = 0 ← factor out (2x + 1) from each term

(2x + 1)(2x - 3) = 0

Equate each factor to zero and solve for x

2x + 1 = 0 ⇒ 2x = - 1 ⇒ x = - \frac{1}{2}

2x - 3 = 0 ⇒ 2x = 3 ⇒ x = \frac{3}{2}

8 0
3 years ago
Other questions:
  • Joel and sharply are selling flowers bulbs for a school fundraiser. Customers can buy bags of wildflowers bulbs and bags of daff
    8·1 answer
  • There are 50 questions to answer in a trivia contest. Each player starts with 100 points. He or she earns 10 points for each cor
    9·2 answers
  • Which glide reflection describes the mapping ABC DEF​
    15·2 answers
  • a 4-digit password is a number that begins with a 3 and does not contain a zero or nine. if digits can be repeated, how many pos
    15·1 answer
  • What is the ratio 7 to 12 as a fraction in simplest form?
    5·1 answer
  • Find the rate of change for <br> growing 22.4 mm in 14 s
    11·1 answer
  • Which of the following actions is not an example of two or more independent events?
    15·1 answer
  • Solve (-2)-|-13|?????????
    15·1 answer
  • Find the slope of a line that passes through points (-1,-5) and (6,9).
    6·2 answers
  • Create an equation from the following statement<br> of 15% of 24
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!