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

In which ways did early people adapt during the last glacial period? Check all that are true. They used animal skins as clothing to keep warm. They lived in lar
Identify the simple subject in the following sentence. Two of his friends studied law enforcement.
Given Sin theta =-1/5 and Tan theta is positive, find theta in degrees and quadrant
if you guys go subscribe to Brandy barn I really need subs
I need help on this.
how many valence electrons are in potassium
Combine the like terms to create an equivalent expression: 4z−(−3z)
the contents of a can of air freshener are gaseous when sparyed,but remain a liquid while in the can due to
HELP ASAP FOR BRAINLIEST ANSWER!!!
Graph the image of this triangle after a dilation with a scale factor of 2 centered at the origin. Use the polygon tool to graph the triangle.