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Soy comes from the verb ser, whilst estoy comes from estar.

This may sound quite complicated, but it’s really simple!

Soy
We use <...

With equations, e.g. 4x = 12, the 4x variable has a given value. This means you can apply the same changes to both sides (at the same time). For example, both sides can be divided by 4 to give x=3
H...

Mitochondria is the power house of the cell, it's a membrane bound organelle which generates energy for cellular activity (e.g. protein production) by generation of ATP through aerobic (requires oxygen) r...

When it comes to solving simultaneous equations the way you structure your working out will really help you get to the correct answer. The layout can be used for all simultaneous equations and will make e...

To solve this equation for x we must first make sure there is a common denominator across the whole equation. In this case as 2 and 3 are both factors of 12, meaning 12 can be divided by them to generate ...