!?!?!?! More Math Help Please!?

6.Draw a graph of a direct variation. Go to the drawing tools and click he. (Note: The icon of the drawing tool may be different, if not working in Microsoft Word.) This should give you a toolbar at the bottom of the screen. Choose AutoShapes, then lines a straight line with two arrows at each end. Used to draw the graph below. 7.In some variation, z varies jointly as x and y, and inversely as W and Z = 2 when x = 3, y = 6 and W = 10. Find z when x = 2, y = 3 w = 5. 8.The amount of material needed to cover a ball is directly proportional to the square of the radius. It takes about 221.63 cm2 of material to cover a ball with a radius of 4.2 cm. What is the radius of a ball that needs 352.92 cm2 of material to cover it? 9.Explain in words how can you tell if a table of values (t-table) represents a direct variation.

And the variation * Direct = xk, k is a constant and reverse = k / x, k is another constant. Problems 7 and 8 are trying to find the constant of variation complicated: 7. Direct Change: XY Z z = K1 reverse = K2 / w so that z = (K1/K2) (xy / W) from K1/K2 is a constant, we can write Z = K (x / w) A z value is known 2 = K (1,8) so K = 10 / 9 Z = 10 / 9 (x / w) For other data: z = 10 / 9 (6 / 5) = 4 / 3 8 is quite similar except A Kr = ^ 2, where A is the surface of the ball.

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