Vertical and horizontal graphs

What is the equation of this line?

• $y=2$

• $x=2$

• $y=x$

• $y=-2$

What is the equation of this line?

• $y=4$

• $x=-4$

• $y=-4$

• $y=-x$

What is the equation of this line?

• $y=-1x$

• $x=y$

• $y=1$

• $x=1$

What is the equation of this line?

• $y=-3$

• $x=-3$

• $y=x-3$

• $x=-y-3$

What is the equation of this line?

• $y=x+1$

• $x=-y$

• $y=x$

• $x=y+1$

What is the equation of this line?

• $y=x+5$

• $x=-y+5$

• $x=5$

• $y=5$

What is the equation of this line?

• $y=-1$

• $x=-1$

• $y=-x$

• $y=x-1$

What is the equation of this line?

• $y=x$

• $x=y$

• $y=-x$

• $y=x-1$