Re-arranging a formula to find Vr

Discussion in 'Homework Help' started by Sparkyian, Nov 2, 2008.

1. Sparkyian Thread Starter Member

Oct 27, 2008
11
0
Hello,

Can someone please help me by explaining how to rearrange the following formula to find Vr:-

VL=Vm-Vr/2

I have been trying for hours and I just can not seem to make it work, therefore I would really appreciate any help that you can provide.

Regards,

Sparkyian.

2. mik3 Senior Member

Feb 4, 2008
4,846
63
VL=Vm-Vr/2

thus VL-Vm=-Vr/2

thus -Vr=2VL-2Vm

thus Vr=2Vm-2VL

simple!!

3. Sparkyian Thread Starter Member

Oct 27, 2008
11
0
Thanks mik3, but what I don't understand is how or why you have cancelled out the minus sign in front of Vr. Please Explain?

4. mik3 Senior Member

Feb 4, 2008
4,846
63
You multiply both sides by - .

5. Sparkyian Thread Starter Member

Oct 27, 2008
11
0
Of course, now I understand, thank you for all your help mik3 I really appreciate your time on this.

6. MareBear Member

Oct 29, 2008
22
0
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