Linear Interpolation

Did the solutionbank go wrong in this question? ( Excercise B Question 1)

https://644625398389466aee00633223056f55519d5fbc.googledrive.com/host/0B1ZiqBksUHNYQWY1UWtNa0NRNU0/CH2.pdf

I have drawn the diagram and got

\frac{13}{3} = \frac {3 - x_1}{x_1 - 2}

(edited 8 years ago)

OP

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Original post by Naruke

Did the solutionbank go wrong in this question? ( Excercise B Question 1)

https://644625398389466aee00633223056f55519d5fbc.googledrive.com/host/0B1ZiqBksUHNYQWY1UWtNa0NRNU0/CH2.pdf

I have drawn the diagram and got

\frac{13}{3} = \frac {3 - x_1}{x_1 - 2}

from the diagram I would agree with you.

Reply 3

Naruke

OP

11

Original post by SeanFM

from the diagram I would agree with you.

Edexcel textbook answers say it's right. What am I not doing right?

Reply 4

Zacken

22

Original post by Naruke

Edexcel textbook answers say it's right. What am I not doing right?

Textbook is wrong as well.

Reply 5

Notnek

21

There have been quite a few people on here who have got confused because of this mistake.

I think it's been corrected in the latest edition of the textbook.

Reply 6

Naruke

OP

11

Original post by Zacken

Textbook is wrong as well.

With these questions, do you always divide the larger height by the smaller height?

Reply 7

Ayman!

15

Original post by Naruke

With these questions, do you always divide the larger height by the smaller height?

Do you know how to use similar triangles? It's the same thing as GCSE Maths! It doesn't matter so long the ratios are the same.

Linear Interpolation

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