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Solve the simultaneous equations: x+y=2 , 4y²-x²=11

These equations would best be solved using the substitution method, in this case the easiest way would be substituting x. For the first equation we need to rearrange it to get x on one side so we have x=2-y....
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Answered by Waris P. • Maths tutor
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Equations

Ran through the 3 different types of GCSE equations
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Answered by Oscar M. • Maths tutor
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The bond angle in a molecule of ammonia (NH3) is 107 degrees so why, when part of a transition metal complex is the bond angle 109.5 degrees.

Ammonia is based off a tetrahedral shape, the central Nitrogen atom has 4 valence (outer) pairs of electrons, 3 in covalent bonds with Hydrogen atoms and one "lone pair" which are not bonded. The t...
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Answered by Daniel W. • Chemistry tutor
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Why are enzymes called catalysts if they are proteins and not chemicals?

A catalyst refers to many types of different molecules or chemicals which can r educe the activation energy of a reaction without being used up itself. Activation energy is the minimum energy required for a ...
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Answered by Meghna V. • Biology tutor
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How is exocytosis different from active transport?

This is a common and understandable mistake that is made since essentially both of these processes refer to molecules being moved out of the cytoplasm of a cell using energy. There is however a major differe...
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Answered by Meghna V. • Biology tutor
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