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Why do we use simultaneous equations?

Simultaneous equations are used to help us find unknown values. An example of simultaneous equations is:1) x + y = 62) 2x + 3y = 16We don't know what the value or X or Y is but we know that together they mak...
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Answered by Amelia G. • Maths tutor
3949 Views

Find the value of X in the equation X^2 + 9X - 22 = 0

There are 3 ways of solving this but I will go through the 2 that are necessary for GCSE level Firstly - 22 can only be made by 1 22 or 2 11 -------> 11 - 2 = 9 therefore 11 and -2 are needed to make the ...
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Answered by Christopher A. • Maths tutor
4669 Views

Rearrange the equation y = 3(x+1)/4, making x the subject.

Firstly, before we even approach the bracket containing the x term, we want to deal with the fraction. The first step should be multiplying by 4 to cancel out the denominator on the right. This leaves us wit...
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Answered by Mustafa C. • Maths tutor
4018 Views

What is diffusion?

Diffusion is the net movement of particles from an area of high concentration to an area of low concentration. This means that the particles of a substance move from where there is lots of it to where there ...
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Answered by Rhiannon J. • Biology tutor
4754 Views

15x^2 − 4x + x^2 + 9x − x − 6x^2 =

15x^2 − 4x + x^2 + 9x − x − 6x^2 = ?First you can break up the question and sort out the x^2 part of the equation to make it easier: 15x^2 + x^2 − 6x^2 = 10x^2Then you are left with solving the second part o...
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Answered by Jonjo H. • Maths tutor
4702 Views