Slope of line 1 is 1/3 and slope of line 2 is 1/3 which means the lines are parallel
Points cannot be parallel or perpendicular. So they never are.
The straight line equation is y = mx + b. If they do not cross and have the same slope they are parallel; if they cross and the slope (m) of one of them is the negative inverse slope of the other (-1/m) they are perpendicular. Otherwise they are neither
4
There should be a lever somewhere on the duct near the furnace. If it is open, the lever will be parallel to the duct. If the damper is closed, it will be perpendicular to the duct.
By definition, A perpendicular line is a line that makes 90 degrees(right angle) with another line. It doesn't state whether it passes through or not. So, the answer to the question, is it depends. If there is a figure, follow it.
Parallel
Points cannot be parallel or perpendicular. So they never are.
The straight line equation is y = mx + b. If they do not cross and have the same slope they are parallel; if they cross and the slope (m) of one of them is the negative inverse slope of the other (-1/m) they are perpendicular. Otherwise they are neither
Base on the slope of two linear equations (form: y = mx+b, where slope is m): - If slopes are equal, the 2 graphs are parallel - If the product of two slopes equals to -1, the 2 graphs are perpendicular. If none of the above, then the 2 graphs are neither parallel nor perpendicular.
4
There should be a lever somewhere on the duct near the furnace. If it is open, the lever will be parallel to the duct. If the damper is closed, it will be perpendicular to the duct.
By definition, A perpendicular line is a line that makes 90 degrees(right angle) with another line. It doesn't state whether it passes through or not. So, the answer to the question, is it depends. If there is a figure, follow it.
false
The answer will depend on whether you mean parallel edges or parallel faces.
They're parallel if their slopes are equal.
The angle between two perpendicular lines is 90 degrees. I am not sure whether you are referring to any other angles, and if yes, which ones.
A right angle triangle has no parallel sides