Posted by **Rana** on Saturday, December 7, 2013 at 11:28pm.

1.) Solve the system by graphing. You may use paper or a calculator.

2x - y = 8

x + 3y = 11

2.) The revenue for a certain brand of toothpaste is y = 2.5x where 'x' is the number of tubes of toothpaste sold and 'y' is the total income for selling 'x' tubes. The cost equation is y = 0.9x + 3000, where 'x' is the number of tubes manufactured and 'y' is the cost of producing 'x' tubes. Find the value of 'x' where the company breaks even.

x=?

Please help, thank you!

- Math Help! -
**Bosnian**, Sunday, December 8, 2013 at 12:39am
1.)

Plot a Cartesian coordinate system

1 equation :

For x = 0

- y = 8 Multiply both sides by - 1

y = - 8

For y = 0

2 x = 8 Divide both sides by 2

x = 4

Mark points ( 0 , - 8 )

x = 0 , y = -8

and ( 4 , 0 )

x = 4 , y = 0

and draw line

2 equation:

For x = 0

3 y = 11 Divide both sides by 3

y = 11 / 3 = 3.67

For y = 0

x = 11

Mark points ( 0, 3.67 )

x = 0 , y = 3.67

and ( 11 , 0 )

x = 11 , y = 0

and draw line

Intersection of this two lines is solution of system.

x = 5 , y = 2

OR

2 x - y = 8

y = 2 x - 8

x + 3y = 11

y = ( 11 - x ) / 3

in google type :

functions graphs online

When you see list of resulrt click on :

Draw Function Graphs - Plotter - Rechneronline

When page be open in blue rectangle type:

2 x -8

in gray rectangle type:

( 11 - x ) / 3

In options :

Range x-axis from set :

- 3 to 7

Range y-axis from set:

- 15 to 5

and click option draw

2.)

2.5 x = 0.9 x + 3000 Subtract 0.9 to both sides

2.5 x - 0 . 9 = 0.9 x + 3000 - 0.9

1.6 x = 3000 Divide both sides by 1.6

x = 3000 / 1.6 = 1875

- Math Help! -
**Anonymous**, Tuesday, March 11, 2014 at 3:31pm
0.9(7x+5)=1.6-(x-3)

## Answer This Question

## Related Questions

- Math - 1.) Solve the system by graphing. You may use paper or a calculator. 2x...
- statistics/ Help!-thanks! - The producers of a new toothpaste claim that it ...
- Algebra 2 - I need help with this problem because I do not have a graphing ...
- algebra - The revenue achieved by selling x graphing calculators is figured to ...
- marketing - Binomial probability distributions are used in business, science, ...
- Univ of Phoenix - Solve the system of equations by graphing. Then classify the ...
- Algebra - Solve each system graphically. 4y = x + 8 3x - 2y = 6 Basically, what ...
- Algebra 2 - I need help with this problem because I do not have a graphing ...
- algebra - i need help with these problems (either a solution or how to plug them...
- MATH! HELP!!! - I am putting < for the square root abbreviation. I don't know...

More Related Questions