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Because the value, x and its inverse, -1/x should multiply together to give -1. This is proof that two lines are perpendicular (or having the same magnitude of gradient but opposite signs +/- ).

This can be tricky in timed conditions, but with practice this should be okay! A few top tips to follow include:

1. Use connectives. This is simple to remember, and encourages you to delve a...

Diffusion may be simple, whereby solutes travel through the phospholipids in the cell membrane as they have the same polarity as a lipid or are small enough to do so.Or, diffusion is faciliated and this i...

A tropism is a growth in a plant in response to a stimulus. The stimulus could be a change in the direction of light or a water source. To recap, a stimulus is a change in the environment of an organism t...

The blood in the capillary has just returned to the lungs from the rest of the body, so contains a low concentration of oxygen. The alveolus contains air that has just been breathed in by ventilation, so ...