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If the two parametric equations have the form x = at + b and y = ct + d then the first step is to rearrange one to make the parameter 't' the subject. We then substitute this equation for 't' int...

dy/dx= (x+2y)/(8y-2x)

blah blah blah

This question is quite chemical, and it's important to draw a diagram when answering it during the exam for both yourself and the marker to show a complete understanding of what is going on. Water is made...

I would suggest that the student looks at 3 areas, form, structure and language. In terms of form, is it a poem, and if so, does it follow a particular rhyme and rhythm? Is it an extract from the novel, a...