**1. Does a formula have to be used when solving problems involving straight line graphs?**

The formulas will always work but it is often useful to sketch a diagram and make sure your answers are sensible

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**2. Do the formulae for coordinate (straight line) geometry have to be memorised?**

It is convenient if they are known off by heart but they are usually given in a test or examination.

**3. Should the gradients of straight lines be given as fractions or decimals?**

It does not matter what form gradients are given in, but a fraction gives a better indication of the steepness, y-step/x-step, of a line.