Identify the solution(s) of the system of equations, if any.
x + 5y = 7
6x - 10y = 18

x + 5y = 7 ; 6x - 10y = 18 ; x = -5y + 7 ; 6(-5y + 7) - 10y = 18 ; -30y + 42 - 10y = 18 ; -40y + 42 = 18 ; -40y = 18 - 42 ; -40y = -24 ; y = -24/-40 ; y = 3/5 ; x + 5(3/5) = 7 ; x + 15/5 = 7 ; x + 3 = 7 ; x = 7 - 3 ; x = 4 ; Solution set: (4, 3/5)

Question

Asked 10/7/2013 12:34:21 AM

Updated 239 days ago|1/25/2018 11:23:46 PM

1 Answer/Comment

Edited by Masamune [1/25/2018 11:23:44 PM]

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3

x + 5y = 7 ;

6x - 10y = 18 ;

x = -5y + 7 ;

6(-5y + 7) - 10y = 18 ;

-30y + 42 - 10y = 18 ;

-40y + 42 = 18 ;

-40y = 18 - 42 ;

-40y = -24 ;

y = -24/-40 ;

y = 3/5 ;

x + 5(3/5) = 7 ;

x + 15/5 = 7 ;

x + 3 = 7 ;

x = 7 - 3 ;

x = 4 ;

Solution set: (4, 3/5)

6x - 10y = 18 ;

x = -5y + 7 ;

6(-5y + 7) - 10y = 18 ;

-30y + 42 - 10y = 18 ;

-40y + 42 = 18 ;

-40y = 18 - 42 ;

-40y = -24 ;

y = -24/-40 ;

y = 3/5 ;

x + 5(3/5) = 7 ;

x + 15/5 = 7 ;

x + 3 = 7 ;

x = 7 - 3 ;

x = 4 ;

Solution set: (4, 3/5)

Added 239 days ago|1/25/2018 11:23:46 PM

This answer has been confirmed as correct and helpful.

Express 0.005 in scientific notation. User: Express 7900000 in scientific notation.

Question

Not Answered

Updated 6/30/2014 5:18:28 PM

2 Answers/Comments

0.005 in scientific notation is 5 x 10^-3.

Added 6/30/2014 5:18:17 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [6/30/2014 5:24:34 PM]

7900000 in scientific notation is 7.9 x 10^6.

Added 6/30/2014 5:18:26 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [6/30/2014 5:24:42 PM]

There are 8 pints in a gallon. How many pints are in 3 gallons? User: In a given training week, a swimmer completes 1/4 mile on day one 2/5, mile on day two 3/7, and mile on day three.
How many total miles does the athlete swim in the given week? **Weegy:** 1.59517 miles **User:** Select the simplified expression for 8(x - 6) - 6(x - 3) + 9x. **User:** The temperature on one day in January for Phoenix, AZ, is 46 degrees Fahrenheit. On the same day in Barrow, AK, the temperature is -17 degrees Fahrenheit.
What is the difference between these two temperatures? (More)

Question

Not Answered

Updated 5/25/2014 9:24:30 AM

2 Answers/Comments

There are 8 pints in a gallon. In 3 gallons are there 24 pints.

8 pints/gallon x 3 gallons = 24 pints.

8 pints/gallon x 3 gallons = 24 pints.

Added 5/25/2014 9:23:46 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [5/25/2014 9:24:50 AM]

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