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basically the reciprocal of the original lines gradient is going to be the gradient for the perpendicular line (remember the signs should switch). For example if i had a line with the gradient of 3, then the gradient of the perpendicular line will be -1over3. But if the line had the gradient of -3, then the line perpendicular to that line will have the gradient 1over3.
If you mean a straight line, then 180 degrees.
2
A straight line through the origin, and with a positive gradient (sloping from bottom left to top right).
The one which shows a straight line with a positive gradient of 3 and crossing the y axis at 2.