Is the line for the equation y = 1 horizontal or vertical? what is the slope of this line? select the best answer.

a.)the line is horizontal. the slope is 0.

b.)the line is horizontal. the slope is 1.

c.) the line is vertical. the slope is undefined.

d.) the line is vertical. the slope is 0.

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.