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Solve the simultaneous equations: 5x + 3y = 41 and 2x + 3y = 20 Do not use trial and error.

5x + 3y = 41 2) 2x + 3y = 20 Subtract equation 2) from equation 1) to cancel the y's (3y-3y = 0) . Next we subtract the x's (5x - 2x = 3x) and then finally we have 41 - 20 = 21. We now have that 3x = 21 ( re...
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Answered by David T. • Maths tutor
20932 Views

Solve the equation "x^2 + 3x - 4 = 0".

Recognise that quadratic can be factorised: (x+4)(x-1)=0 This gives the solutions x=-4 and x=1 by inspection.
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Answered by Zak K. • Maths tutor
3890 Views

Qu’est-ce que tu fais pour aider l’environnement?

Moi, je fais de nombreux choses pour aider l’environnement. Premièrement, dans ma maison on recycle tout ; le papier, le verre, même les vêtements. Deuxiement, j’essaie toujours de me souvenir d’éteindre les...
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Answered by Denys W. • French tutor
9023 Views

I do not think I can come up with a "common question" for English, as I will explain below

English is quite different from most other subjects in that it is heavily source-based, both in one's understanding but also in the simple components to a question. I will separate this explanation into two ...
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Answered by Sam W. • English tutor
2854 Views

What is the importance of aerobic respiration?

Aerobic repiration produces ATP whilst recycling NAD. NAD recycling to NAD+ is important in glycolysis, an anaerobic respiratory process.
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Answered by Anna K. • Biology tutor
5777 Views