Thread: Angles between lines

Find the angle between x=2+3t, y= -1-t and x+3y=0
Been having trouble with this one, part of extra work.
thanks for the help

Originally Posted by monkius

Find the angle between x=2+3t, y= -1-t and x+3y=0
Been having trouble with this one, part of extra work.
thanks for the help

solving the y equaiton for t you get

then sub this into the equation for y to get



try putting both equations into standard form and what do you notice?

Good luck.