19. Which statement describes the relationship between the line graphs of the equations below?

Question

y=-2x+4
y=0.5x+4

A.The line graph are the same line.
B.The line graph are parallel lines.
C.The line graph are perpendicular lines.
D.The line graphs intersect, but are not perpendicular.
E. Can't determine
I think the answer is choice C.

Answer 1

-2 = -1/.5
so they are perpendicular, yes, C