laquitawinston laquitawinston
  • 02-02-2015
  • Mathematics
contestada

3x+y=5 , 2x-2y=22 solve the system of equations by the addition method

Respuesta :

konrad509
konrad509 konrad509
  • 02-02-2015
[tex]3x+y=5\\ 2x-2y=22\\\\ 3x+y=5\\ \underline{x-y=11}\\ 4x=16\\ x=4\\\\ 4-y=11\\ -y=7\\ y=-7\\\\ \boxed{(x,y)=(4,-7)} [/tex]
Answer Link
eu99li
eu99li eu99li
  • 02-02-2015


3x+y=5

2x-2y=22 ...............2(x-y)=22 ⇒ x-y=11

3x+y=5

x-y=11                   (+)

3x+x+y-y=11+5

4x=16  /:4

x=4

x-y=11

4-y=11

-y=7 /*(-1)

y=-7


Answer Link

Otras preguntas

Suppose we wanted to know whether the yellow-green morph produced more seeds than the standard green morph under the best possible conditions. we have data on t
Where are endocrine glands found?
List 3 ways that society was transformed during the Middle Ages Plague.
Please help, What does a Transverse and longitude wave combine to form?
Ok, I am have a test on slopes tomorrow and I don’t understand them at all can you give me help on it
What is the third angle of a right triangle if one of the angles measures 51.1
how many times have presidents sent troops into action
zachary can spend no more than $94 per day to rent a car. A car rents for $30 per day $0.20 per mile. What is the maximum number of miles that he can drive the
Match the period of writing to the work. 1. last play Venus and Adonis 2. early 17th century tragedy King Lear 3. late comedy Richard II 4. history play 1590s H
What is 98.809 as a mixed number