Question

Is the line with equation x = 4 horizontal or vertical? What is the slope of this line?

Answer 1

plot two points with x=4
when x=4, y can be anything. so plot (4,0) and (4,1)
draw a line through these points

Answer 2

Vertical.
Pi/2 or 90 degrees

Answer 3

it only says to find the slope, so its anything?

Answer 4

and isnt it horizontal cause its on the x axis

Answer 5

slope is change in y divided by change in x
change in y for (4,0) and (4,1) is 1-0=1
change in x is 4-4 =0
1/0 is undefined

vertical lines have undefined slope

Answer 6

oh so its 0?

Answer 7

vertical lines have undefined slope

Answer 8

ok so then y = -8 is horizonal and is undefined?

Answer 9

y= -8 means y is -8 and x is anything. so (0,-8) and (1,-8) are on the line
now find change in y divided by change in x

Answer 10

i still dont get it

Answer 11

Does this make sense
y= -8 means y is -8 and x is anything.

Answer 12

yes