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Firstly you draw your x and y axis. The x-axis is the horizontal line and the y-axis is the vertical line. The coordinates of a point help you understand its location from the centre, which on the x and y...

First, note that we have x² in the denominator. This tells us that x² cannot equal to 0. So we have the boundary condition that x is not equal to 0. Now, to get rid of the denominato...

History GCSE and A Level qualifications all require you to look at and evaluate sources. When you are looking at a source, your main goal is to consider its NOP (Nature, Origin, and Purpose). Whether a so...

Analysis: First define tax and explain that this could be ad valorem (percentage of price) or per unit (set tax per unit). Explain why the government would want to do this - overconsumption can cause obes...

=((143x)-(147y))+((-2x21)-(-2xy))=42x-98y-42x+2xy=2xy-98y