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How do I solve 3x + y = 11 & 2x + y = 8?

In order to solve this set of simultaneous equations, we will rearrange each equation to use substitution. The aim of this problem is to find out what the value of x and y is. Let's rearrange equation 1 and ...
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Answered by Naomi O. • Maths tutor
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How can I factorise a quadratic equation?

A quadratic equation is an equation of the form y = a x 2 + b x + c where a, b and c are constants (for example 5, -2 or 0). To "solve" a quadratic equation we are finding the values of x that sati...
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Answered by Tom R. • Maths tutor
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How do I prepare for an essay question based on an unseen text?

When preparing for an essay question that is based on an unseen text, many students see this as a daunting concept, as I did when studying for my A levels too! However, in reality, you will know the text a l...
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11872 Views

Outline some of the evidence for evolution

The fossil record provides a comprehensive array of evidence for evolution. For example Darwin studied Brachiopods, and within rocks you can see the clear change in the Brachiopods through time. The fossil r...
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Answered by Kelly T. • Biology tutor
3814 Views

Describe the process by which a pathogen is destroyed after it has become attached to the surface of a phagocyte.

Pathogens are first recognised as a foreign body by the antigens on it's membrane, as they are non-self antigens. The body then triggers a response by attaching antibodies to these antigens. Phagocytes can d...
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Answered by Kelly T. • Biology tutor
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