Is the line for the equation x = 4 horizontal or vertical? what is the slope of the line? select the best answer.

the line is horizontal. the slope is 0.
the line is vertical. the slope is undefined.
the line is horizontal. the slope is undefined.
the line is vertical. the slope is 0

we know that

The slope of the lines parallel to the y-axis or vertical lines is undefined and the slope of the lines parallel to the x-axis or horizontal lines  is equal to zero

In this problem we have

This is the equation of a vertical line parallel to the y-axis

the slope is undefined

therefore

the answer is the option

The line is vertical. The slope is undefined

a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: