1) 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
3S = 75
S = 75 / 3 = 25
L = 5 + 2S
= 5 + 2(25)
= 5 + 50
= 55
-----------------------------------------------------------------------------------------------------------------
2) [-7,2)
- Vocabulary
· Interval
A set of values between two endpoints.
· Inequality
A mathematical expression which shows that two quantites are not equal.
