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How to solve the simultaneous equations 3x+2y=7 and 5x+y=14

Firstly we rearrange one of these equations so that we have y on one side of the equation on its own. Let's do this with the second equation. So from 5x+y=14, we can minus 5x from both sides to get: y=14-5x ...
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Answered by Imogen B. • Maths tutor
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What is meant by the term polygenic inheritance? [2 marks]

This term refers to the idea that a single characteristic is encoded for my multiple genes at different loci . This gives rise to continuous variation.
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Answered by Odette F. • Biology tutor
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Explain how a vaccination prevents infection [3 marks]

The main way in which vaccinations prevent infection is by causing white blood cells to produce antibodies . These antibodies are produced rapidly upon re-infection and kill the pathogens.
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Answered by Odette F. • Biology tutor
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用括号中的词语“只要……就……”重写下面的句子，并保持句子原意:"凡是自己想做又能够做的都是休闲。"

只要自己想做又能够做的就是休闲。 (This is a question from A level Chinese Test Paper 2 - Reading and Writing)
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Answered by Mingfang S. • Mandarin tutor
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What is diffusion? (GSCE: OCR, Edexcel, AQA)

Definition : diffusion is the spreading out of particles from an area of high concentration to an area of low concentration The theory: Diffusion, is the scientific description for the gradual movement of pa...
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Answered by Ned F. • Biology tutor
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