A larger number is five more than twice the smaller number their sum is 80 find the number

how do I set this up?

L = 5+2s

Step-by-step explanation:

Let L = the larger # and S = the smaller #.

A large # is 5 more than twice a smaller # ... This gives Eq 1) L = 5 + 2S

Their sum is 80 ... This gives Eq 2) L + S = 80.

Substitute Eq 1) into Eq 2), you get

L + S = 80

5 + 2S + S = 80

L = 5 + 2S