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Solve the simultaneous equations: x^2 + y^2 = 29 and y - x = 3

To solve these equations we need to eliminate one of the variables, so make y the subject of the second equation: y = x + 3. Now y can be substituted into the first equation: x^2 + (x+3)^2 = 29. Expanding (x...
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Answered by Trisha G. • Maths tutor
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What is a conservative plate boundary and what's an example?

The San Andreas Fault is an example of a conservative plate boundary. Here, the 2 plates slide past each other in opposite directions, generating friction as they do. They can also move in the same direction...
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Answered by Sarah C. • Geography tutor
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What is Lamarck's theory?

Lamarck's theory suggests that changes that are obtained during a lifetime can be passed on to the offspring of that creature. The changes typically favour survival for the animal. For example, if a giraffe'...
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Answered by Sarah C. • Biology tutor
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How is crude oil separated into fractions?

The crude oil is placed into large tanks, which are heated at the bottom, creating a gradient whereby the column is cooler at the top. The heat causes the oil to evaporate, and each fraction will reach a dif...
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Answered by Sarah C. • Chemistry tutor
4014 Views

What is a topic sentence and why should I use them?

A good structure is crucial for a good essay because it allows the reader to follow your line of argument and because it prevents any confusion. One of the key elements of a good paragraph, therefore, is a t...
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Answered by Helena L. • English tutor
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