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Solve the simultaneous equations: 3x + 4y = 5 and 2x – 3y = 9

To solve a simultaneous equation we use a method known as elimination. We choose to 'eliminate' or remove the X or Y term. To 'eliminate' x we must firstly determine the lowest common multiple 3 and 2 (as th...
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Answered by Prasanna G. • Maths tutor
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Factorise the following equation: y = 2x^2 + 4x - 6

For this question, it is best to first take out a factor of 2 from the equation. This will leave you with y=2(x 2 +2x-3). We then need to work out the two numbers that will multiply to -3 and add to 2. We ca...
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Answered by Stephen C. • Maths tutor
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What is involved in active transport?

This question comes up often in GCSE papers and is a key topic when talking about exchange or cell biology. Active transport comes hand in hand with diffusion and osmosis. It is a key mechanism for moving su...
CS
Answered by Charlotte S. • Biology tutor
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Define the three types of chemical bonding.

Ionic bonding occurs between metallic and non-metallic atoms. Electrons are transferred from metal atoms to non-metal atoms. This results in positively charged metal ions and negatively charged non-metal ion...
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Answered by Ellie P. • Chemistry tutor
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Giving an overview of the two different processes, compare and contrast the processes of spermatogenesis and oogenesis.

In spermatogenesis, germline epithelium in the seminiferous tubules of the testes divides by mitosis and then a period of cell growth occurs, changing them from spermatogonia to primary spermatocytes. These ...
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Answered by Eashan P. • Biology tutor
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