Which of the slope is an equation of a line whose slope is 0?

1) : Y=6

2) : x=6

3) : y=2x

4) : x+y=1

1) y=6

Step-by-step explanation:

The equation y=mx+b is called slope-intercept because it tells us the slope, m, and y-intercept, b.

The equation y=a is a horizontal line and goes through a on the y-axis. Horizontal lines have a slope of zero.

The equation x=b is a vertical line and goes through b on the x-axis.

Vertical lines have an undefined slope.

1) y=6 is horizontal so it's slope is 0

2) x=6 is vertical so it's slope is undefined

3) y=2x has slope 2

4) x+y=1 can be put into the form y=mx+b to determine the slope.

Subtract x on both sides:

y=-x+1

The slope is - 1.