Any line with a slope of zero is parallel to the

x-axis

Step-by-step explanation:

a line in the cartesian plane is defined by the general equation:

where is the slope and is the y-intercept, so for a given value this return a value for .

When the slope of a line is equal to zero () we have:

 ( has always the same constant value)

which means that the value of for any given is the same, we have a constant function, that is represented in the plane as a horizontal line.

So when the slope is zero the line is a horizontal line, which is parallel to the x-axis since the x-axis is also a horizontal line.

the answer is b.

step-by-step explanation:

identity property is where 0+whatever number=whatever number. basically 0+ a number.