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
Lelechka [254]
3 years ago
8

Find the value of the variable for which the value of the expression –3(2x+1) is 20 greater than the value of the expression 8x+

5
Mathematics
1 answer:
Charra [1.4K]3 years ago
6 0
<h3>Answer:</h3>

-2

<h3>Step-by-step explanation:</h3>

20 greater than 8x +5 is ...

... 8x +5 +20 = 8x +25

We want this value to be -3(2x +1), so we want to solve the equation ...

... 8x +25 = -3(2x +1)

... 8x +25 = -6x -3 . . . . . . eliminate parentheses

... 14x = -28 . . . . . . . . . . . add 6x-25

... x = -2 . . . . . . . . . . . . . . divide by the coefficient of x

The desired value of the variable is -2.

_____

<u>Check</u>

-3(2x+1) = -3(2(-2)+1) = -3(-3) = 9

8x+5 = 8(-2) +5 = -11

9 is 20 greater than -11, so the answer checks OK.

You might be interested in
!SUBSTITUTION METHOD!<br><br>6y - 5z = -8 <br>3z = -6 <br>4x - 3y - 2z= 21​
hichkok12 [17]

Answer:

<h2>x = 2 </h2><h2>y = - 3</h2><h2>z = - 2</h2>

Step-by-step explanation:

6y - 5z = -8 .......... Equation 1

3z = -6 ................... Equation 2

4x - 3y - 2z= 21...... Equation 3

<u>First solve for z in Equation 2</u>

That's

3z = - 6

Divide both sides by 3

<h3>z = - 2</h3>

Next substitute the value of z into Equation 1 in order to find y

We have

6y - 5(-2) = - 8

6y + 10 = - 8

6y = - 8 - 10

6y = - 18

Divide both sides by 6

<h3>y = - 3</h3>

Finally substitute the values of y and z into Equation 3 to find the value of x

That's

4x - 3(-3) - 2(-2) = 21

4x + 9 + 4 = 21

4x + 13 = 21

4x = 21 - 13

4x = 8

Divide both sides by 4

<h3>x = 2</h3>

So the solutions are

<h3>x = 2 </h3><h3>y = - 3</h3><h3>z = - 2</h3>

Hope this helps you

3 0
3 years ago
CAN SOMEONELEASE PLEASE PLEASE ANSWER ALL THESE QUESTIONS THIS IS DUE BY MIDNIGHT
Romashka [77]
Where are the questions?
6 0
3 years ago
Read 2 more answers
Suppose you are the manager of a high school cafeteria. You want to create a new breakfast and lunch menu for the students. Desc
zubka84 [21]

Answer:

by making a recipt with a cash machine or putting a thing for everytime someone buys something

Step-by-step explanation:

3 0
2 years ago
How Many solutions are there for the<br> following system.<br> y = x² - 5x + 3<br> Y = x - 6
emmasim [6.3K]
Only one solution, x=3
7 0
3 years ago
Which of the following represents "the difference between ten and a number is the sum of eight and a number"? 10 - N(8 + N) 8 -
Setler [38]

Answer:

\Huge \boxed{10-N=8+N}

Step-by-step explanation:

<h2>Algebraic expressions</h2>

Difference: should be subtract.

N: should be a number.

Sum: Add

Therefore, the correct answer is 10-N=8+N.

Hope this helps!

7 0
3 years ago
Read 2 more answers
Other questions:
  • What's the word phrase for 1.9 + n
    13·1 answer
  • Slope:-2;y intercept: 3
    8·1 answer
  • Help me please ..............................................................
    5·1 answer
  • NEEEEEED HELP PLEASE
    10·1 answer
  • Write a explicit and recursive formula for -4,-6,-8,-10
    11·1 answer
  • What is the answer to this 4 1/3 x 6 please help
    12·1 answer
  • PLEASE need help on 3 questions!!
    12·1 answer
  • What is the singular multiplier for 35%
    10·1 answer
  • Can someone please explain how to do this​
    10·1 answer
  • There are 16 ounces in 1 pound. Juan is mailing a package that weighs 96 ounces. he wants to know the weight of the package in p
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!