Are the two vectors parallel, orthogonal or neither? How to tell

What is the condition for two lines to be parallel?

• They have different slopes.

• Their dot product is zero.

• They intersect at a right angle.

• They have the same slope.

What is the dot product of vectors U and V if U = (1, 3) and V = (-3, -1)?

• 3

• 6

• 0

• -6

If the dot product of two vectors is zero, what can be concluded about the vectors?

• They are neither parallel nor orthogonal.

• They are parallel.

• They are orthogonal.

• They are identical.

What conclusion can be drawn if two lines have different slopes and their dot product is not zero?

• The lines are parallel.

• The lines are orthogonal.

• The lines are neither parallel nor orthogonal.

• The lines are identical.

Which of the following is true if two lines are neither parallel nor orthogonal?

• They have the same slope.

• They intersect at a right angle.

• Their dot product is zero.

• They have different slopes and non-zero dot product.