Book Maths Puzzle Algebra

Using matrices solve the system

x - y + z = 17
2x + 3y + z = 8
-4x + y + 5z = -2

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Book Other Question

Find an equation for the line that passes through the points of intersection of the circles x^2+y^2=25, and x^2-3x+y^2+y=30 can you explain all the steps thanks write an equation in slope intercept form that satisfies each condition passes through (7,1) and (7,8)