Nonlinear
Ray.
a line segment
The word straight does have an antonym, which is crooked. So perhaps a crooked line is the opposite of a straight line.
for example a straight line.(is it straight up and down)
for example a straight line.(is it straight up and down)
Word collocation
The word "straight" as you wrote it does not contain a prefix. A prefix is a letter or group letters added on to the beginning of a word that has a meaning of its own. The word "straight" has no letters added to the beginning of it.
It is flat. Meaning it is just plain and straight.
direct, candid
Line up outside the ship.Make sure you line these up straight.
The word straight doesn't really apply to an equation. However the graph of a linear equation is a straight line.
its skewif, not skew wiff. I belive its a northen Irish word meaning crooked/bent/not straight.