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

Which of the following statements describes French service? A. Guests help themselves from a buffet table. B. The appropriate silver is placed before each cour
What is the product of 7/10x5/6 written in simplest form? A.7/16 B.5/12 C.3/4 D.7/12
A descriptive essay is a. a personalized story developing a theme or explaining an event. b. a vibrant form of writing that brings a thing, place, event, or p
What is the term for an opening that grabs the reader's attention? A. convention B. transition C. thesis D. hook
What does accuracy mean in a dance form?
What is percent of 300 is 129?
How many 2 1/2 hour movie can be shown consecutively in a 20 hour period?
What was the most highly prized fabric in China? rayon cotton silk polyester
Lincoln worried about reapplying fort Sumter because
Which word in the sentence does the adverb modify? The new neighbors planted a rose garden yesterday. a. rose b. neighbors c. planted d. garden