Question

Soulve a/4 + b/5 = 1 for b

Answer 1

b = 5 - 5/4 a

Explanation:

a/4 + b/5 = 1

Multiply by 20 to clear the fractions

20*(a/4 + b/5) = 1*20

5a +4b = 20

Subtract 5a from each side

4b = 20 -5a

Divide by 4

4b/4 = 20/4 - 5a/4

b = 5 - 5/4 a