Solve the inequality 19y<13, and write the solution in interval notation.

Question

Solve the inequality 19y<13, and write the solution in interval notation.

Answer 1

Divide both sides by 19 to get y<13/19

In interval notation the solution is (-infinity, 13/19)

Instead of -infinity or negative infinity, the usual notation looks like an 8 on its side with a

minus sign in front of it..

( and ) are used to indicate the solution does not include the end points.

If the solution did include the end points, you would use brackets, [ ] around the endpoints of

the interval. A comma separates the endpoints. But negative infinity is never included.

had the original equation said less than or equal to, then you'd use a bracket for the upper end point.