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Solve the simultaneous equations: 3x + y = 15 and 4y + 3 = 9x

The best way to solve simultaneous equations is by substitution. The first step is to pick a variable to eliminate. In this case, I'm going to choose to eliminate y because the first equation has a y on it's...
SB
Answered by Samuel B. • Maths tutor
5526 Views

I don't understand, what do you use sin, cos and tan for?

Sin, cos and tan are functions that help you work out either, the missing angle or one of the missing lengths of a side in a right angle triangle.To work out the missing angle you need two side lengths, depe...
JD
Answered by Joe D. • Maths tutor
4016 Views

Rearrange the formula to make a the subject: b = (2a + 5)/3

b = (2a + 5)/3 Step 1 - Multiply both sides by 33b = 2a + 5Step 2 - subtract 53b - 5 = 2aStep 3 - divide by 2(3b - 5)/2 = a
AB
Answered by Annie B. • Maths tutor
5215 Views

Explain how Beethoven achieves a sense of drama in the extract from the first movement of Piano Sonata no. 8, 'Pathétique.

There are lots of different techniques composers use to create drama. I would have a checklist of different areas to listen out for:Tempo – It is likely to be quite fast, or perhaps there are sudden changes ...
CM
Answered by Clare M. • Music tutor
9027 Views

Over a year, the number of rabbits in a field increases by 25% and then by a further 30%. Originally there were 200 rabbits in the field how many were there at the end?

Originally the number of rabbits was 200. We therefore need to find 25% of 200 and then increase the value of 200 by the 25%, we will then know how many rabbits there are after the 25% increase. 25/100 x 200...
AE
Answered by Alba E. • Maths tutor
3641 Views