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How do I solve this problem of second - degree equations?

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Sketch the graphs of each pair of circles to determine the number of points of intersection. If the circles are tangent or fail to intersect, say so. Then solve the system.

2 2 2 2
x + y - 4y= 0, x = y - 2x = 4

How do I go about solving?

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The expert solves problems with second degree equations.

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