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Solve 2x+y=6, 3x+2y=3 for x and y.

Give each equation a label:(1) 2x+y=6(2) 3x+2y=3Multiply one equation to make the number of x's or y's the same in each equation. 2 X (1) : 2(2x+y=6) 4x+2y=12 (2) 3x+2y=3There are now 2y's in each equation t...
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Answered by Emily W. • Maths tutor
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At room temperature and pressure, the first 4 alkanes are all gases, but the first 4 alcohols are all liquids. Explain this.

Alkanes are non-polar so only have London forces between them. These intermolecular bonds are weak, and easily overcome with little energy. This means that alkanes have a low boiling point hence they are gas...
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Answered by Ayolola E. • Chemistry tutor
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In a perfectly competitive labour market, explain how equilibrium wages are determined by the forces of supply and demand.

The labour market is a factor market, which is a market where the factors of production are traded. The supply of labour comes from the pool of economically active citizens who want to be employed. Labour de...
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Answered by Anish J. • Economics tutor
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Outline two cognitive explanations for depression (6 marks).

One cognitive explanation involves Ellis’s ‘ ABC Model’ (1962). Ellis explains that the key to depression lies in irrational thinking. ‘ A ’ represents an activating event - for instance being fired from wor...
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Answered by Simran S. • Psychology tutor
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When a nerve impulse arrives at a synapse, it causes the release of neurotransmitter from vesicles in the presynaptic knob. Describe how.

Membrane depolarisation arrives at the pre-synpase and causes Ca2+ voltage-gated channels to open. This allows Ca2+ ions to diffuse in the presynapse via the activated Ca2+ channels. Ca2+ influx in the presy...
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Answered by Georgios M. • Biology tutor
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