The line with slope -1.7 and through point (9, -9) represents a direct variation.

A direct variation has the form y = kx, so its graph must pass through the origin. Using the slope -1.7 and point (9, -9), the line is y + 9 = -1.7(x - 9), which simplifies to y = -1.7x + 6.3. Since its y-intercept is 6.3 rather than 0, it is not a direct variation, so the statement is false.

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