Question

Compare the lines in each pair. Are the lines parallel, perpendicular, or neither? Explain.
a) L1= [x,y,z]+[10,2,-3]+t[5,1,-5]
b) L2=[x,y,z]+[1,1,0]+s[1,5,2]

Answer 1

I don't know how to tell. Sorry

Answer 2

They are parallel if the slope ie your coefficients for t and s are equal.
They are perpendicular if the coefficients on your t and s are the negative reciprocal of each other.

Answer 3

Neither is if they don't share the same slope or negative reciprocal of the slope. For example, the lines y=2x+4 and y=3x+2 are neither