2. Then add heat. After 24 hours, use heat to dilate the blood vessels and improve circulation in the area. Warm compresses will help speed up the bodys natural mechanisms for removing the blood in the bruise, says Randy Wexler, M.D.
where k is the constant of variation. Since k is constant (the same for every point), we can find k when given any point by dividing the y-coordinate by the x-coordinate. For example, if y varies directly as x , and y = 6 when x = 2 , the constant of variation is k = = 3 . Thus, the equation describing this direct variation is y = 3x .
Direct Variation. Words: a line that has a constant âkâ and goes through the origin. Symbols: y = kx, where k is a number (positive or negative) Example: y = 3x. 3 or k is called âconstant of variationâ or âconstant of proportionalityâ Example 1 The height of the water as a pool is being filled is shown in the graph.