Question 1087590
solution:

({{{a}}},{{{b}}}) is reflected over the y -axis to the point at ( {{{j}}} , {{{k}}} )

so, ({{{ j}}} ,{{{ k }}}) = ({{{-a}}}, {{{b}}}) 

{{{a+j= (a+(-a))=a-a =0}}}

{{{ b+k=b+b=2b=0}}},=> {{{b=0}}}