On Jun 1, 9:16*pm, Gerry wrote:
...
I cannot cut straight with either. Hoping to get a cut better than I
could do with a hacksaw

This is a good opportunity to learn. Use a new blade, mark the line on
two faces, start at the corner and cut a shallow kerf down each line.
The kerf guides the blade while you cut deeper. With practice you
won't need it but it helps at first.

I have a lot of trouble with thin slitting saws. I set the drive belt
fairly loose and reduce depth of cut if it jams.

jsw