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.