Book Maths Puzzle Co-ordinate geometry

M=1/2

R(0,0)

Write in slope intercept form

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Book Other Question

A pool measuring 10 meters by 20 meters is surrounded by a path of uniform width. If the area of the pool and the path combined is 600 square meters, what is the width of the path?
Thank you
find the solution to the system by graphing

x+y=5
2-y=7