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Try y = 2x - 3, x + 2y = 8, x = 3, x^2 + y^2 = 25, or a point (4, 2). Drag to move, scroll to zoom.
y = 2x - 3
x + 2y = 8
x = 3
x^2 + y^2 = 25
(4, 2)