(Original post by krisshP)
Below are two lines:
Are these two lines parallel, perpendicular or neither?
I'm stuck on this question. Aren't both lines parallel??
This is because there is no gradient for both lines.
Let's say we have a line in the form:
y = m + c
where 'm' is the gradient and 'c' is the y-intercept.
Then two lines are parallel if they have the same gradient
Two lines are perpendicular if m = m'. By this I mean the gradient of one line is the negative reciprocal of the gradient in one of the other lines,
You have two ways of solving this:
1) Write your two lines in the form y = mx + c and then go forwards from here, using the definitions I have given you.
2) Plot both lines and see it geometrically, although most questions will require you do it algebraically. I'd recommend solving it algebraically and then checking it geometrically.
Last edited by claret_n_blue; 03-07-2012 at 13:39.
y = 1/3 simply means the y value is always 1/3. If i was you i'd sketch the graph. It's a bit of a trick question in my opinion.
No idea why i got a neg for this. Others are just over complicating things massively.
Last edited by KyraBloke; 03-07-2012 at 13:49.