Answer
Option H
Work Step by Step
If A = 0 in standard form ($Ax + By = C$), then you can write the equation in the form y = b, where b is a constant. The graph of y = b is a horizontal line.
$F: 3x+6y=2$ with $A=3$
$G: 2x+7=2$ with $A=2$
$H: -3y=29$ with $A=0$
$I: x-2y=4$ with $A=1$
Thus, equation H is an equation of a horizontal line.