The slope of the tangent to a curve at any point (x, y) on the curve is negative 1 times x divided by y. Find the equation of the curve if the point (2, −2) is on the curve. x + y = 0
x2 − y2 = −2
x2 + y2 = 16
x2 + y2 = 8

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Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for