Whichof the followingequationscouldrepresenta line parallelto the one Millicentdrew?A.
B.
C.
D.
All you reallyneedto do to solvethis problemis identifythe slopeof the line in Millicent’s graph.Identify
two pointson the graph,and find the slopeusingthe slopeformula.Use points(0,5) and (1,3).
The slopeof Millicent’s line is All you haveto do is identifywhichequationamongthe four choiceshas
a slopeof You can disregardall otherinformation.The only equationthat has a slopeof is choice
C, so it is the correctanswer.
Equationsof PerpendicularLines
You also studiedperpendicularlines and their graphicalrelationshipsin the last lesson.Rememberthat the
slopesof perpendicularlinesare oppositereciprocals.In this lesson,you will learnhow to easilyidentify
equationsof perpendicularlines.Lookfor equationsthat havethe slopesthat are oppositereciprocalsof