ok i know you probably think im stupid for not getting this but....
i dont get
r=2s-8
solving for the s.
please help!! i have a quiz tomorrow!! ahhhhhhhhhh!!!
Well, all we have to do is make the s be on one side of the equation BY ITSELF, so we take our original problem:
$\displaystyle r = 2s - 8$
First, we add 8 to both sides of the equation:
$\displaystyle r + 8 = 2s - 8 + 8$
Notice what's left on the right side:
$\displaystyle r + 8 = 2s$
Now we divide both sides of the equation by 2:
$\displaystyle \frac{1}{2}r + 4 = 2s/2$
Look what's left:
$\displaystyle \frac{1}{2}r + 4 = s$
And problem solved.
All you have to do is move everything to the other side by doing the opposite to both sides of the equation.