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
grin007 [14]
3 years ago
9

Given that 4x-5y = 21 Find x when y = -4. Give your answer as a fraction in its simplest form.

Mathematics
2 answers:
alexira [117]3 years ago
6 0

Answer:

x = 1/4

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality

Step-by-step explanation:

<u>Step 1: Define</u>

<em>Identify</em>

4x - 5y = 21

<em>y</em> = -4

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. Substitute in <em>y</em>:                                                                                                  4x - 5(-4) = 21
  2. Multiply:                                                                                                             4x + 20 = 21
  3. [Subtraction Property of Equality] Subtract 20 on both sides:                      4x = 1
  4. [Division Property of Equality] Divide 4 on both sides:                                  x = 1/4
blsea [12.9K]3 years ago
4 0

Answer:

1/4 (One over Four)

Step-by-step explanation:

Step 1. Multiply -5 with -4 (Negitive x Negitive is always Positive!).

Step 2. Subtract 20 (From step 1) from 21.

Step 3. divide 4x by 1.

You might be interested in
Hey yall i need help again im just lazy but will mark brainlyest
ElenaW [278]

Answer:  1=1 question 2 = 1 again 5-6 is the next and 4 3-10  5-6 next answer2-7  3-8 5-4 -22--9 2-29 are all the answers

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
PLEASSSSEEEE SOLVE AND EXPLAIN WILL GIVE BRAINLIEST
Aleks04 [339]

Answer:

15w³

Step-by-step explanation:

you need to check for the of 225w^6 and see what you can take out.

you can take 3 w's out. and 225 is a perfect square, because 15² = 225

(basically the answer you have in there but you just have to get rid of square root)

8 0
3 years ago
Who can help!!! asap​
Ilya [14]

Answer:

0.33= 33/100

<h2>Hope it helps...</h2>
4 0
4 years ago
Read 2 more answers
If a triangle has a side length of 10 <br> 12 and 15 what type of triangle is it
Alex73 [517]
Acute. Step-by-step explanation: Using the Triangle Inequality Theorem you know that the sum of the lengths of two sides of a triangle are greater than the length of the third side.
8 0
3 years ago
The population of a city on April 15, 1915, was 47,175. During the period between March 1 and July 1, 1915, 1,325 new cases of s
Norma-Jean [14]

Answer:

the incidence rate is 28.47

Step-by-step explanation:

The computation of the monthly incident rate of active cases is shown below:

Incidence rate is

= 1325 ÷  (47175 - 642) × 1000

= (1325 ÷ 46533 ) ×  1000

= 28.47

hence, the incidence rate is 28.47

7 0
3 years ago
Other questions:
  • Eighth grade AA.8 Solve a system of equations using substitution clouds Solve using substitution. 4x + 7y = 9 y = 3 ( , ) Submit
    11·1 answer
  • The range is the set of <br> A. first coordinates<br> B. ordered pairs<br> C. second coordinates
    11·2 answers
  • Wat is the mixed improper fraction for 50/10=
    11·2 answers
  • For the following, write an equivalent expression in standard form: (5x2 + 6x - 2) + 4x (3x – 7).
    12·1 answer
  • A truck rental company charges a $25 rental fee when someone rents.a
    9·2 answers
  • I need help with this one
    15·2 answers
  • What is the true number of pi
    10·2 answers
  • An arithmetic series contains 20 numbers. The first number is 102. The last number is 159. Which expression represents the sum o
    13·1 answer
  • PLS HELP!!!
    11·2 answers
  • 1) Danielle completely covered a square window using 18.4 ft of contact paper without any
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!