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It is better to think of it as substituting one equation into another, rather than thinking of it as ‘making it equal to zero’. Say you have a quadratic equation y = x^2 - x - 6 and you want to find it’s ...

HACER Unlike regular verbs in the present tense, 'hacer' has an irregular stem in the first person singular (yo) form.
The conjugation in the present tense is as follows: YO - hago, TÚ - haces, ÉL/E...

If you look at a set of x,y-axes, and imagine any curve going through both axes (you don't have to be able to imagine what this graph of f looks like just yet). Now imagine the part of the graph that cros...

x+y=2 (1) x²+2y=12 (2) As we are dealing with x² we’re going to have to use substitution to solve this set of simultaneous equations. From the first equation, we can rearrange to mak...

The most important thing for these questions is a clear and relevant application of what you know, what basically adds up to being a clear structure and clear line of argument. What do you mean by "e...