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Normal manipulation of inequalities does not affect the direction of the inequality such as:
addition
subtraction
multiplication or division by a positive number, 

Reminder - a cartesian equation is written in terms of x and y (e.g. y = 2x + 3) while parametric equations are written with x and y separately in terms of t.

Example: Find the cartesian ...

Electron pairs arrange themselves so they are as far apart as possible (electron pair repulsion theory). In a covalent compound, the number of electron pairs around the central atom determines the shap...

The war that took place between 1945 and 1991 has been termed the 'Cold War', largely due to the fact that the two main agitators (The Soviet Union and The United States of America) never came into dir...

Finding stationary points.

You can find stationary points on a curve by differentiating the equation of the curve and finding the points at which the gradient func...