Answer:
r = va/(e - v)
Step-by-step explanation:
v = er/(r + a)
vr + va = er
va = er - vr
va = r(e - v)
r = va/(e - v)
Answer:
The answer is
[tex]r = - \frac{va}{v - e} [/tex]
Step-by-step explanation:
You have to get rid of fraction first :
[tex]v = \frac{er}{r + a} [/tex]
[tex]v(r + a) = er[/tex]
[tex]vr + va = er[/tex]
Next, you have to move all the r-variables to one side :
[tex]vr + va = er[/tex]
[tex]vr - er = - va[/tex]
Lastly, make r the subject :
[tex]vr - er = - va[/tex]
[tex]r(v - e) = - va[/tex]
[tex]r = - \frac{ va}{v - e} [/tex]
