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Solve 8x + 9y = 3 and x + y = 0.

We have 8x + 9y = 3 [1] and x + y = 0 [2].We can make x or y the subject. Take y as subject we have y = -x [3].We substitute [3] into [1] and get 8x - 9x = 3 --> -x = 3 --> x = -3.Substituting x = -3 i...
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Answered by Theresa O. • Maths tutor
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How do I make sure that I avoid 'waffle' in my essay?

Keep referring back to the essay question! If your essay question is about an author/playwright, for example: How does Shakespeare present Lady MacBeth in Macbeth in the extract?How does Austen present happi...
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What is the basic essay format for an extract question?

Introduction2 or 3 sentencesWhat happens in the extract?What has just happened before the extract?What changes as a result of the extract? 3 Paragraphs for the body of the essayONE main point per paragraphEa...
EO
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Describe how phagocytosis of a virus leads to presentation of its antigen

The phagosome containing the virus fuses with the lysosome, which then releases hydrolytic enzymes. These enzymes then destroy the virus, and the antigens from the virus are consequently incorporated into th...
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Answered by Sam F. • Biology tutor
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Given that Y=(x+3)(x+5); find dy/dx

Y=(x+5)(x+3) ............(1)The above expression on the right is a product of two expressions,Hence, product rule differentiation method will be employed as stated below:Y(u,v)=U(x).V(x) .........(2)dy/dx=Ud...
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Answered by Dr Edosa O. • Maths tutor
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