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How do I solve simultaneous equations by substitution?

You can solve simultaneous equations by either substitution or elimination. Say we have the equations:(1) 8y + 6x = 24 and (2) 2y - x = 6SUBSTITUTION METHODFirst, you need to find x in terms of y (or y in te...
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Answered by Joshua N. • Maths tutor
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Find all values of x in the interval 0 ≤ x ≤ 2pi for 2sin(x)tan(x)=3

This questions involves the use of trigonometric identities, specifically [1] tan(x) = sin(x)/cos(x) and [2] sin 2 (x) + cos 2 (x) = 1. Start by rearranging the given equations to tan(x) = 3/2sin(x) by divin...
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Answered by Jasmin C. • Maths tutor
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Describe the role of bile in the digestive system

Bile is made in the liver and stored in the gall bladder. Bile emulsifies fatty acids and lipids, breaking large chains into smaller droplets. This increases the surface area for enzymes (lipase) to act on, ...
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Answered by Bella P. • Biology tutor
18651 Views

- What is the difference between ‘ce que’ and ‘ce dont’ in French?

Ce que and ce dont are indefinite relative pronouns that link relative clauses to main clauses in a sentence. Ce que is used as the direct object in a relative clause, for example: « Je ne comprends pas ce q...
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Answered by Carla P. • French tutor
27705 Views

Explain why the reactivity of Group 2 elements increases down the group.

Moving down Group 2, the atomic radius increases as there are more electron shells. This also means that the outermost electrons are more shielded from the positive charge of the nucleus. This decreases the ...
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Answered by Joe C. • Chemistry tutor
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