Question

Solve P = 2(l + w) for l. What are the missing values in the table?

P w l
14 2 ?
22 8 ?

Answer 1

Just replace the numbers and solve for the missing variable

Answer 2

P/2=l+w
l=P/2-w

Answer 3

P = 14, w =2
14 = 2( I +2 )
divide both sides by 2
7 = I +2
rest is simple algebra.. same way find the value of I when P = 22 W = 8

Answer 4

Or a better way is to isolate the variable you are trying to find before plugging in.

Answer 5

Since we are trying to solve for I we divide both sides by 2 and then subtract W

Answer 6

P = 2(l + w)


\[\frac{p}{2} - w = I\]

Answer 7

ok thanks