princessbrianna113 princessbrianna113
  • 03-12-2021
  • Mathematics
contestada

3a +4b =2. 4a -4b =12 elimination

Respuesta :

loneguy
loneguy loneguy
  • 03-12-2021

[tex]3a+4b =2~~~....(i)\\\\4a-4b = 12~~~.....(ii)\\\\\\(ii) + (i)\\\\4a-4b +3a+4b = 12 +2\\\\\\\implies 7a = 14\\\\\implies a = \dfrac {14}7 = 2\\\\\\\text{Substitute a = 2 in equation (i):}\\\\3(2) +4b =2\\\\\implies 4b =2-6 = -4\\\\\implies b = - \dfrac44 =-1[/tex]

[tex]\text{Hence,}~ (a,b) = (2,-1)[/tex]

Answer Link

Otras preguntas

Lamar has n decks of cards. each deck has 52 cards in it. using n write an expression for the total number of cards Lamar has
Which amendment would strict constructionists look to in order to justify a limited interpretation of the Constitution?
How did World War II change the United States’ position in world affairs?
Doctors do not administer vaccinations to people who are too sick. Which best explains why? A. The weakened or dead form of the pathogen may not have any effect
The Emergency Highway Energy Conservation Act was passed in 1974. Under this act, states would only get federal highway funding if they set a speed limit of 55
Beowulf slays grendel to?
Which igneous rock has large crystals surrounded by smaller crystals
Explain how cobalt-60 and cobalt -59 can be the same element but have different mass numbers
what is the standard form of the parabola whose vertex form is Y=-(X-3)^2+11
Which is one theory about what caused the decline of the Indus Valley civilization? A. Earthquakes in the Himalayas caused massive destruction. B. Diseased anim