my ass!
straight line
Unless it is a direct proportion, the straight line does not have to start from zero.
A kind of weird line that is straight.
Yes. Line segments are straight, by definition.
If it is a straight line through the origin then it represents a direct proportion.
The shortest distance between two points is... a straight line.
straight, as in rectilinear which is a straight line.
Assuming both the scales on the graph are linear (that is to say that the numbers go up evenly) then YES, a graph which shows direct proportion must be a straight line. It must also pass through the origin (0,0). A straight line which does not pass through the origin is NOT showing direct proportion. Duncan
A straight angle is by definition 180°.
a graph that does not have a straight line
The definition is any chart where one or more points lie off the straight line joining the other points.
straight line