algebra 2 question?

Question

parallel lines have equal slopes. Two pairs of the line indicated by the given points are parallel. Give the problem numbers of the parallel lines

_____&_____ , ______&_____






Also...

Perpindicular lines intersect to form right angles.(if they are not vertical or horizontal, then the product of the slope equals
-1.) Two pairs of the lines indicated by the given points are perpindicular lines;

_______&_______ , ________&_______


remember* i will choose the best answer not the first one

Answer 1

(1,1) and (4,4) are on the line y=x, grad=1
(1,5) and (4, 8) are on the line y=x+4, grad=1

These two lines are parallel because the gradients are equal.

(1,1) and (4,4) are on the line y=x, grad=1
(-1,1) and (-4,4) are on the line y=-x, grad=-1

These two lines are perpendicular because the product of their gradients is -1.

Answer 2

You have not given any points, just blank lines.

Answer 3

what are the lines indicated?