# Can't understand how this works?

#1
Attachment 553346553348Attachment 553346553348553340I was working out fhe normal to a curve from my further maths revision guide, and I was fine until I got to the answer.
The revsion guide gave the answer as y+5=-1/4(x+2) or y=-1/4x-11/2
I got the y+5=-1/4(x+2) but can't understand how it could become y=-1/4x-11/2? Am I just being really dumb?
I'll attach a picture of the question in the revision guide, the answer in the revision guide, and my working out in case that can help any. Thanks!

(It's question 1, and sorry the working out is messy)
0
6 years ago
#2
The first one just rearranges to give the second? You've done the difficult bit lol x
1
6 years ago
#3
if you expand the right hand side you get y+5=-1/4x-1/2 then if you want y on its own you have to take away five, to make it easier to understand I will take away 10/2 which is 5. so y=-1/4x-10/2-1/2 which is y=-1/4x-11/2
2
#4
(Original post by khaleesi98)
The first one just rearranges to give the second? You've done the difficult bit lol x
(Original post by Synmatic)
if you expand the right hand side you get y+5=-1/4x-1/2 then if you want y on its own you have to take away five, to make it easier to understand I will take away 10/2 which is 5. so y=-1/4x-10/2-1/2 which is y=-1/4x-11/2
Ah thankyou, I realise where I've gone wrong, I was trying to minus a quarter from two.
2
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