the sum of two integers is greater than 20. the second number is three times as large as the first number. find the range of the first number.
step-by-step please
:D
thanks!
2006-10-18 14:25:14 · 3 answers · asked by UCFcheer_chick 2 in Education & Reference ➔ Homework Help
1. x + y > 20
2. y = 3x (Then substitute)
3. x + 3x > 20
4. 4x > 20
5. x > 5
6. The first number is greater than 5. The range can also be written as (5,infinity) in interval notation.
2006-10-18 14:32:48 · answer #1 · answered by Justin A 3 · 1⤊ 0⤋
A + B > 20
3b=a
a = 15 then b=5
so 'a' cannot be 15 so.. 18 to infinity.. or anything above 15 depending if you can use all intigers or just counting numbers
a = any number divisible by three from eighteen to infinity
2006-10-18 21:30:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋
call the first number x, so the second number is 3x
we have:
x + 3x > 20
=> 4x > 20
=> x > 5
2006-10-18 21:31:08 · answer #3 · answered by hoang_hiepsi 4 · 0⤊ 0⤋