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2x + 7y = 14 and x + y = 2. Find the value of x and y which satisfy both equations.

There are 2 ways to solve simultaneous equations which are by substitution or elimination. In this example you can use both but elimination is simpler. So we have 2x + 7y = 14 and x + y = 2. To use eliminati...
AS
Answered by Amir S. • Maths tutor
4944 Views

Differentiate x^x

With the methods we know at A Level we cannot current differentiate x x in its current form. Therefore let y = x x To turn it into a form we can differentiate we take the natural log of both sides. This give...
Answered by • Maths tutor
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I have invested £10000 for 5 years and I how have £12763 in my account. What is my banks interest rate?

This question is an example of compound interest rates. The question asks to find the interest rate of the bank. So first of all we should form an equation relating our initial amount, interest rate, time an...
AS
Answered by Amir S. • Maths tutor
3675 Views

Solve these equations simultaneously, y= 5x - 9and, x=2y

X=2Y=1
CP
Answered by Charlie P. • Maths tutor
3331 Views

Solve the curve xy=2 and x+y=3

This question is a simultaneous equation, this means we substitute one value into the other equation.We are looking for the points where the curves intersect.First I would take x+y=3 and bring the y over to ...
PM
Answered by Peter M. • Maths tutor
5278 Views