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# Fp1 help watch

1. Could someone explain Question 7 from here please:

http://store.aqa.org.uk/qual/gceasa/...W-QP-JAN09.PDF

I know how to use linear interpolation (by subbing in x values to get y, then finding gradient and solving the straight linequation for x+c = 0) but Im totally stuck here.

Please help,
thanks
2. for part i) I think you have to use similar triangles ( Triangles PQD and PRA)
where D is the point where line x=a meets y=d
A is the points (a,0)
3. (Original post by Rohit93)
for part i) I think you have to use similar triangles ( Triangles PQD and PRA)
where D is the point where line x=a meets y=d
A is the points (a,0)
Hmm I prefer to use the line equation as opposed to similar triangles. Although I still have no idea whats going on in part a) lol.
4. (Original post by marek35)
Hmm I prefer to use the line equation as opposed to similar triangles. Although I still have no idea whats going on in part a) lol.
I don't know the line equation method, but for similar triangles you make a ratio of the sides, so you have:

c/(c - d) = (r - a)/(b - a)
5. (Original post by Rohit93)
I don't know the line equation method, but for similar triangles you make a ratio of the sides, so you have:

c/(c - d) = (r - a)/(b - a)
Mhmm but I prefer to use the straight line eqn method as thats what Im used to.

Thanks anyway.

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