the sum of two numbers is -4 and their difference is -10. find the numbers. (translate to a system of equations and solve)
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I can't explain it but if you need me to explain it I can but here is my work.
We must find a pattern in the powers of 3:
So, as you can see, both and
end with 1. So, we can generalize as follows:
Since , we can deduce that
ends with 9.