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

How did the Space Race symbolize the struggles of the Cold War? A) Scientific collaboration between superpowers B) Promotion of peaceful international relations
What kind of metamorphosis roaches have
Using the formula v=4over3 pie radius cubed solve what is the volume of a sphere with a radius of 39.6m rounded to the nearest tenth of a cubic meter
Solve the system by substitution. y, equals, 3, x, plus, 14 y= 3x+14 y, equals, x y= x
_____ will affect a salesperson's behavior and performancea) Role perceptionsb) Aptitudec) Skill leveld) Motivation levele) All of the above
The height of a fireplace must be 36 inches or less ?
Lexa works at a camp arcadia during the summer to make some extra money for school. she works 20 hours a week and $9.25 an hour. lexa usually works 80 hours a m
Mateo made 2 out of 8 shots. What percentage of his shots did he make?
What do i do un muy homework that se ya Explain what each oficio te quantitis un te problema means
4. Write a Riddle of your own which have a moral concept 10​