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 two numbers have a difference of 5 and a product of 3.36???
which city was located nearest the nile river delta
If you are writing a persuasive essay in favor of banning vending machines in schools, which is a counterargument you might anticipate?
which city was located nearest the nile river delta
Which two numbers have a difference of 5 and a product of 3.36???
which city was located nearest the nile river delta
which city was located nearest the nile river delta
which city was located nearest the nile river delta
which city was located nearest the nile river delta
what other areas beside egypt did the new kingdom pharoahs conquer