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Okay. Do you have any idea where to start?

Hint : if you have two straight lines and they are perpendicular
Then M1 x M2 =-1
when M = Slope .

No.
How did you get that answer?

uhh, I'll work it out step by step
y=mx+b m=-3 (x,y)=(5,7)
(7)=-3(5)+b
7+15=b
b=22

okay - tell me your final answer :)