first off, let's notice something

so then, any parallel line to this one will have the same slope of 5, and any perpendicular line will have a negative reciprocal of that

now, a y-intercept is when the graph touches the y-axis, and that happens when x = 0, so these two lines pass through the point (0, 6).
a)
parallel, slope of 5

b)
perpendicular, slope of -1/5
