Respuesta :
					                   b. x=4 
bc on a graph x=7 is a straight vertical line going through 7 on the x-axis, so the only other parallel line possible is x=4, which is also a straight vertical line going through the x-axis.
					                
					             bc on a graph x=7 is a straight vertical line going through 7 on the x-axis, so the only other parallel line possible is x=4, which is also a straight vertical line going through the x-axis.
