10th grade

posted by jj Saturday, October 30, 2010 at 5:51pm.

BC=3x+2 and CD= 5x-10. Solve for x.

• 10th grade - Jen Sunday, October 31, 2010 at 12:15am

  Does BC=CD? If so,
  3x+2=5x-10
  12=2x
  12/2=x

• 10th grade - Cindy Tuesday, April 12, 2011 at 4:57pm

  if BC=DC then you would do
  
  3x+2=5x-10
  
  then you do algebra by adding 10 to both sides like this
  3x+2=5x-10
  +10 +10 the 10s cancel out
  ------------
  3x+2=5x
  
  then you subtract 3x from both sides like soo
  
  3x+12=5x
  -3x -3x 3Xs cancel out
  -----------
  12=2x then you divide 2 from both sides
  /2 /2
  
  answer: 6=X