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Solve the simultaneous equations: (1) y – 2x – 4 = 0 , (2) 4x^2 + y^2 + 20x = 0

Rearrange (1): y=2x+4 Subsitute this into (2): 4x 2 +(2x+4) 2 +20x=0 Simplify and collect like terms: 8x 2 +36x+16=0 Factorise: (2x+1)(x+4)=0 Therefore: 2x+1=0 -> x=-0.5 and x+4=0 -> x=-4 Substitute th...
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Answered by Anastasia T. • Maths tutor
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How does this person describe his experience? "Durante los Juegos Olímpicos del 2012 los turistas gastaron dinero en la capital. Esto ayudó la economía de Inglaterra y me alegró mucho."

This question is taken from a 2016 GCSE past paper. In language exams there are lots of reading comprehension questions. For this question in an exam, there would be lots of different people's viewpoints and...
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Answered by Rosanna L. • Spanish tutor
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Why does Magnesium Oxide have a higher melting point than Sodium Chloride?

Both Magnesium Oxide and Sodium Chloride exist as a giant ionic lattices where each oppositely charged ion is held in place by a strong electrostatic attractions. These ionic bonds are strong and require a l...
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Answered by James C. • Chemistry tutor
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"In the years 1865 to 1880, the Conservatives did more than the Liberals to improve the lives of the working classes." Discuss.

In the context of this period, to 'improve' their lives, a successful government would need to embark on: political reform to enfranchise the working class and social reform to create an egalitarian society ...
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Answered by Aisha R. • History tutor
3602 Views

Use examples to explain how sustainable schemes can be used to manage transport in urban areas

Sustainable transport can be defined as transport which meets the need of the present without compromising the needs of future generations. It must be both environmentally and financially sustainable, utilis...
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Answered by James C. • Geography tutor
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