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September 20, 2014

Posted by **Veronica** on Monday, July 4, 2011 at 12:43pm.

Dave can vote. (18 or over.) Dave is 5 years older than Jim. Jim is not old enough to vote. Write a mathematical inequality expressing Dave's age. (Hint: determine Dave's maximum and minimum age.)

So I have his minimum age as 18 and his maximum age as 22. That's how old he can be while the other is too young to vote. But how do I write the inequality?

- Algebra 1 -
**Quidditch**, Monday, July 4, 2011 at 1:39pmlet J=Jim's age

let D=Dave's age

It is given that Dave can vote.

So

D>=18

Dave is 5 years older

J+5=D

or

J=D-5

Jim can't vote.

J<18

Substitute for Jim's age:

D-5<18

Solve this for the upper limit for Dave's age.

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