Homework Help Forum: algebra

Posted by julie on Wednesday, November 4, 2009 at 6:15pm.

can someone please tell me how to solve these, thanks! 1.2(3b-4)=8b-11 2.5(r-1)=2(r-4)-6 3.2y+3=3(y+7) 4.15x-10=-9x+2

• algebra - Lisa, Wednesday, November 4, 2009 at 6:23pm

  1.2(3b-4)=8b-11 6b-8 = 8b-11 -2b = -3 b = 3/2

  
  

• algebra - julie, Wednesday, November 4, 2009 at 6:26pm

  i don't get it :( at all

  
  

• algebra - Lisa, Wednesday, November 4, 2009 at 6:28pm

  3. 2y+3 = 3(y+7) 2y+3 = 3y+21 -y = 18 y = -18 I have helped you on # 1 and 3, now I think you can manage doing 2 and 4.

  
  

• algebra - Lisa, Wednesday, November 4, 2009 at 6:31pm

  for # 3, you can use the distributive property. 2y+3=3(y+7) 2y+3 = 3y+21 subtract 2y from both sides of the equation 3 = y+21 now subtract 21 from both sides -18 =y

  
  

• algebra - Lisa, Wednesday, November 4, 2009 at 6:33pm

  4. 15x -10 =-9x+2 15x +9x = 2+10 24x = 12 x = 1/2

  
  

• algebra - julie, Wednesday, November 4, 2009 at 6:36pm

  ohhh i get it thanks!

  
  

• algebra - Lisa, Wednesday, November 4, 2009 at 6:38pm

  I'm really glad you do, and you're welcome;)

  
  

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