Answer:
b = 5 - 5/4 a
Step-by-step 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
