Write an equation of a line passing through the point (-6, -3) and perpendicular to JK with J(-2, -7) and K(6, 5). I don’t understand how to get the equation and what the formula is.

Total number of students = 1000, broken down as follow:

324 :   students who said they spend more than 1 hour every day "video games"

368 :   students who said they spend more than 1 hour every day "studying"
  87 :   students who said they spend more than 1 hour in playing & studying 

and 221 students who are neither playing nor studying:

324 + 368 +87 + 221 =  1,000

87 only were playing and studying ,  or 87/1000 = 0.087