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.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

the answer is 48m^2!

step-by-step explanation: