Book Maths Puzzle Algebra

x-y=10
5x-y=-6
what is x and y?

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Book Other Question

wat is the solution to this equation?
n + 18 + 2n = -12
a.) n = -10
b.) n = -2
c.) n = 1/2
d.) n = 6
e.) n = 9 Hi there, my question is this:

A square boxing ring is 20ftx20ftx20ftx20ft, how far apart are the fighters when they are in oppoaite corners?