Whats the graident of the line segment between the points (4,-6) (-6,-16)

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

Using the figure below, select the two pairs of alternate interior angles.a: point 1 and point 4 b : point 2 and point 3 c: point 6 and point 6d: point 5 and point 7

Anyone know these questions? i need ,.