xxalinax50
xxalinax50 xxalinax50
  • 01-09-2020
  • Mathematics
contestada

Solve for the variable!
1. 2x + 21 = 40
2. 4x - 12 = 3x + 9
3. 3(x -1) + 2 = 7x

Respuesta :

Annder
Annder Annder
  • 01-09-2020

Step-by-step explanation:

1. 2x + 21 = 40

2x = 40 - 21

2x = 19

x = 19/2 = 9.5

2. 4x - 12 = 3x + 9

4x - 3x = 9 + 12

x = 21

3. 3x - 3 + 2 = 7x

3x - 1 = 7x

-1 = 7x - 3x

-1 = 4x

4x = -1

x = -1/4

= - 0.25

Answer Link

Otras preguntas

Hydrogenous sediments originate from elements in a. cold water. b. seawater. c. warm water. d. freshwater.
Who was an astronomer during the Renaissance? Raphael Niccolo Machiavelli Johannes Kepler Mansa Musa
I REALLY NEED HELP ON MY HOMEWORK so how do you know if a fraction is simplified already
what are two reasons kennan felt the munich agreement was unnecessary
Do you agree with Shelley's implied "solution" to the problems of the laborers? Why or why not? Use complete sentences. (From the poem Son to the Men of England
5x=15 what is substituted for x?
when would there be only for different equations for a set of math mountain numbers
True or false, Acids give soaps their useful properties?
Write the following number in standard decimal form. four and forty-two ten-thousandths
what two mixed numbers have the sum of 8 4/8 and the difference is 2 2/8