Pls help me pls pls pls

Whats is the value of the variables ?

Lines a and b are perpendicular. the equation of line a is y=13x+3. what is the equation of line b?

Amanager measured the number of goods,  y, that his company produced in  x  hours. the company produces goods at a rate of  5  per hour. at hour  9,  the company had produced  45  goods.which equation, in point-slope form, correctly represents the goods produced by the company after  x  hours? a.y−45=5(x+9)b.y−45=5(x−9)c.y+9=5(x+45)d.y−9=5(x−45)