C.18 Rearrange multi-variable equations

Question

WSJ
Solve for d in terms of r.
r=
d
2
d=

Answer 1

To solve for \( d \) in terms of \( r \) from the equation \( r = \frac{d}{2} \):

1. Start with the original equation: \[ r = \frac{d}{2} \]

2. To isolate \( d \), multiply both sides of the equation by 2: \[ 2r = d \]

So, the solution for \( d \) in terms of \( r \) is: \[ d = 2r \]

To summarize:

• \( r = \frac{d}{2} \)
• \( d = 2r \)