(B) Given the equation: $0x + 3y = 21$.Simplifying this,we get $3y = 21$,which implies $y = 7$.The equation $y = 7$ represents a horizontal line paral

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(B) Given the equation: $0x + 3y = 21$.Simplifying this,we get $3y = 21$,which implies $y = 7$.The equation $y = 7$ represents a horizontal line parallel to the $x$-axis.$A$ line that is parallel to the $x$-axis is perpendicular to the $y$-axis.Therefore,the graph of the equation $0x + 3y = 21$ is perpendicular to the $y$-axis.