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Make x the subject of the equation y=(3x+5)/(4-x)

(1) Get rid of the fraction by multiply both sides by (4-x), we now have y(4-x)=3x+5. (2) Expand any brackets, so 4y-py=3x+5. (3) Rearrange to get all the x to one side: 4y-5=3x+px. (4) Factorise x because w...
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Answered by Gwen F. • Maths tutor
13046 Views

What is the difference between 'ser' and 'estar'?

Although they both translate to 'to be' in English, in Spanish we use these two different verbs, and it depends on the quality you are trying to describe. For example, 'estar' is used to describe something t...
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Answered by Teresa B. • Spanish tutor
3173 Views

How do I know whether to use passé composé or imparfait?

It can be tricky to tell - and sometimes it's even a matter of choice! However, there are some simple rules that you can remember. The passé composé is used for specific events - things that happened, like a...
SM
Answered by Sophia M. • French tutor
4637 Views

A and B are two points. Point A has coordinates (–2, 4). Point B has coordinates (8, 9). C is the midpoint of the line segment AB. Find the coordinates of C

Think about the x-coordinate and the y-coordinate separately. Starting with the x-coordinate: Find the difference between the two x-coordinates -2 and 8, which is 10. to find the mid-point, we need to half t...
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Answered by Gwen F. • Maths tutor
21986 Views

What is red shift?

You see colours due to the length of a wave of light. When a distant galaxy is moving away from us the wavelength increases due to the Doppler Effect (which you may have studied using the sound of a passing ...
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Answered by Carys L. • Maths tutor
4577 Views