Question

2l+w=30

Solve for l.

Answer 1

You have two variables and one equation. You can only express l in terms of w.

Is this what you want? If so, isolate l on one side.

Answer 2

how do i do that?

Answer 3

subtract w and then divide by 2

Answer 4

l=(30-w)/2

Answer 5

First you subtract all the terms other than l onto one side (in this case \(w\) is the term to subtract):
\( 2l+w=30 \)
becomes:
\(2l=30-w \)

Then you divide both sides by the coefficient (in this case 2 is the coefficient):
\(2l=30-w \)
becomes:
\(l= \frac{30-w}{2}\)
\(l= 15 - \frac{1}{2}w\)