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A great question. A system of equations ("system" meaning more than one equation) with two variables looks like this:
x + y= 8
2x + 3y = 5
There are several methods to solving systems of equations, including "substitution," "elimination,"...
Here's a simple proportion that you can use to solve your question:
amount of change =
original number 100
where r is the rate of change or the percent. In your case, that rate would be 60%. You will also need to...