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How do I solve the simultaneous equations x-2y=1 and x^2-xy+y^2=1?

Depending on what you prefer, you can either substitute or you can try to solve this by elimination. I'll explain both. 1) x - 2y = 1 2) x 2 - xy +y 2 = 1 If solving by elimination, you need to start thinkin...
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Answered by Katerina S. • Maths tutor
14536 Views

explain diffusion and give an example

diffusion is the movement of particles from a high concentration to a low concentration through a semi permeable membrane. an example would be the movement of food molecules through the gut wall as they pass...
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Answered by Charlie H. • Biology tutor
2995 Views

Following Teresa May's Brexit speech, the UK exchange rate in terms of euros depreciated from 1.13 to 1.08. If a firm sells 20000 units at 4 euros per unit, what is the difference in the firms revenue following the change in the exchange rate?

Total sales abroad: 20000 x 4 euros = 80000 euros Pound amount = Euro amount x ER Before ER change: 80000 x1.13 =90400 pounds After ER change: 80000 x 1.08= 86400 pounds 864-904 = -4000 pounds Therefore, rev...
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Answered by Josh R. • Economics tutor
2375 Views

Find the value of x when x^2-x-6=0

We firstly need to look how to factorise quadratics. (x )(x ) By looking at this, we need 2 numbers that add together to make -1. We need 2 numbers that multiply to make -6. To multiply to make -6, we need a...
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Answered by Josh R. • Maths tutor
5935 Views

Êtes-vous optimiste ou pessimiste pour l’avenir en ce qui concerne la technologie?

A mon avis, la technologie peut en même temps aider et détruire la société. Bien sûr, pour le médecin, il vaut mieux qu’on ait plus de recherche qui soutient les procédures pour guérir, par exemple avec le c...
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Answered by Sasha B. • French tutor
3859 Views