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Solve the simultaneous equation: 2x - 5y = 9 , x + 6y = -4

First multiply the second equation by 2, so it becomes 2x + 12y = -8. Then subtract the second equation from the first one which gives (2x - 2x) + (-5y - 12y) = (9 - -8), -17y = 17. Therefore y = -1. Plug th...
AC
Answered by Anagh C. • Maths tutor
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why are all atoms neutral?

All atoms are neutral because all atoms have the same number of protons as they have electrons. Atoms are made up of a nucleus and electrons that surround their nucleus in shells. The nucleus contains proton...
FB
Answered by Freya B. • Chemistry tutor
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‘Thomas Hardy’s tone remains strongly melancholic.’ Discuss.

Hardy’s poetry can often be seen as melancholic. His use of imagery, such as in ‘Neutral Tones’, appeals to the passing of the seasons and a deadness in the landscape to evoke a sense of sadness and melancho...
AC
Answered by Ailin C. • English tutor
2890 Views

‘Stalin was a disaster for the USSR.’ Discuss.

Stalin’s dictatorship had huge significance for the USSR. His five-year plans led to a massively increased industrial output, increasing the USSR’s exports and income. Yet this came with heavy costs, and arg...
AC
Answered by Ailin C. • History tutor
2848 Views

Explain the 3 types of DNA mutation substitution?

For DNA there are 4 types of bases: A, T, C, G.A codon is made from 3 bases, and codes for either an amino acid, or a stop.Mutation substitution means that one base is replaces by another base, eg: an “A” be...
AS
Answered by Alisha S. • Biology tutor
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