Any line with an undefined slope is parallel to the

x-axis

y-axis

line y = x

Hence, Any line with an undefined slope is parallel to the y-axis.

Step-by-step explanation:

We know that the slope of a line is calculated as:

To find the slope, you divide the difference of the y-coordinates of 2 points on a line by the difference of the x-coordinates of those same 2 points .

For the slope to be undefined the change in the x-value must be zero so that the denominator will be zero and hence the slope is undefined.

This means that x-value is constant.

This means that the line is parallel to y-axis since if the line is parallel to y-axis then the y-value changes and x remains constant.

Hence, Any line with an undefined slope is parallel to the y-axis.

d 25 pi/6

step-by-step explanation:

the diameter is 10 inches

the radius is 1/2 of the diameter or 5 inches

the area of the circle is

a = pi r^2

  = pi 5^2

  = 25 pi

the slice is 60 degrees of the entire circle.

60 degrees out of 360   60/360 = 1/6

the area of the slice is 1/6 of the circle

a slice = 1/6 a circle

a slice = 1/6 * 25 pi