In some simultaneous equations neither the two coefficients of \(x\) nor the coefficients of \(y\) match. You will need to find numbers to multiply each equation by so that one pair of coefficients ...

This paper provides a full exposition of the proportionality coefficients used in two different differential equation models, allowing for a more complete understanding of their meaning in the context ...

These can be tough, but use this method to minimise losing marks. The trick with this one is to always double check your answer by multiplying out the brackets and comparing your answer with the ...