eachother. In this caseit doesn’tmatterwhatthe -interceptis; as long as the slopesare oppositerecip-
rocals,the lines are perpendicular.
Example 3
Kierandrewthe line in this graph.Whichof the followingequationscouldrepresenta line perpendicularto the one Kierandrew?A.
B.
C.
D.
All you reallyneedto do to solvethis problemis identifythe slopeof the line in Kieran’s graphand find its
oppositereciprocal.To begin,identifytwo pointson the graph,and find the slopeusingthe slopeformula.
Use points(0,2) and (3,4).