# MAT - Paper 2012 - Q1G

> Source: https://ollybritton.com/notes/maths/problems/mat/2012/q1g/ · Updated: 2021-08-13 · Tags: mat, maths, notes

## Flashcards
##### ![PHOTO MAT 2012 Q1G](mat-2012-q1g.png) Why shouldn't you use matricies to tackle MAT questions like this??
Because there are no matricies in the exam spec, so the question has been written to be solved differently.

##### $$y = \frac{4 - 2k}{k - 2}$$ Why can't $y$ ever be positive??
For $4 - 2k$ to be positive, $k$ has to be less than $2$. However, when $k$ is less than $2$, $k - 2$ is negative.

##### You've rearranged some simulatenous equations and got $$y = \frac{4 - 2k}{k - 2}$$ Why is still worth trying to substitute $k = 2$ back into the original equation??
Because $k = 2$ might be a special 'singular' case.

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