Wednesday
September 17, 2014

Homework Help: Algebra

Posted by Maria on Thursday, September 14, 2006 at 7:24pm.

I'm not quite sure about these problems. I know how to do them, but it seems that I get the wrong answer. Maybe I'm supposed to get 'no solution' but I'm not sure. Could someone please help me with them?

5|6-5x|=15x-35
2|3x-7|=10x-8
1/4|4x+7|=8x+16


Ok for
5|6-5x|=15x-35
first simplify it by dividing both sides by 5
Then check the intervals where
6-5x>0 then where 6-5x<0.
In other words, find where the expression in the absolute values is 0 and divide the interval into two parts there. Since the other 2 problems are similar I'll walk through the first one.
You should get
|6-5x|=3x-7 when you divide the 5's out. Then we look where
6-5x=0 which is 6/5
When x>6/5 the LHS(left hand side) is +. Setting
6-5x=3x-7 means 8x=13 or x=13/8
However, the RHS is positive when
X>7/3 so there is no solution when x>6/5
If x<6/5 then |6-5x|=3x-7
-(6-5x)=3x-7 so
-6+5x=3x-7 , 2x=-1 and x=-1/2
Again, 3x-7>0 means x>7/3 so no solution here either.
You could also verify this by graphing too.
The LHS and RHS can sometimes be zero at the same time, so check the valuse that make them both 0 too. For this problem the LHS is 0 at 6/5 but the RHS isn't. Conclude no solution for this one.

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