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Solve the simultaneous equations 5x + y = 21, and x - 3y = 9.

2 unknowns? Let's make it into a simpler equation you know how to solve with only one unknown! How? Key is to note that you can add and subtract equations. You can also multiply the equations by some constan...
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Answered by Sara H. • Maths tutor
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How do enzymes lower the activation energy of reactions?

Enzymes are biological catalysts for lowering activation energy - the speed up the rate of reactions and all allow biological reactions involved in metabolic processes to take place at body temperature (37C)...
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Answered by Katie J. • Biology tutor
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Explore Williams' presentation of Stanley as a character with whom the audience cannot sympathise in A Streetcar Named Desire. You must relate your discussion to relevant contextual factors.

In presenting Stanley's relationship with his wife Stella, Williams portrays him as a vicious partner who sees the bond between them as hierarchical, hence making him seem unsympathetic to, in particular, a ...
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Solve the following simultaneous equations: (1) 3x – 2y = 7 (2) 5x + 2y = 17

When looking at the two equations we can see that the 'y' terms in both equations are the same, but with the opposite sign. This means that by adding the two equations we can eliminate the 'y' values. Step 1...
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Answered by madeleine f. • Maths tutor
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What is type 1 diabetes and give two ways in which it can be controlled.

Type 1 diabetes is condition whereby the pancreas doesn't produce enough insulin, as a result the individual's blood sugar levels can rise to a dangerously high level that can be fatal.There are two key ways...
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Answered by Samirah O. • Biology tutor
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