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 .
In the following equation y varies directly with x, and k is called the constant of variation: Another form of variation is the inverse variation which works when there is a relationship between two variables in which the product is a constant.When one variable increases the other decreases in proportion so that the product is unchanged.hen we have a variation where one quantity varies as the product of two or more other quantities we have what is called joint variation: Videolesson: State whether each equation represents a direct, inverse or joint variation: xy=7 y=xz x/y=4. 1  Pre-Algebra. 2  Algebra 1. 3  Algebra 2. 4  Geometry. 5  Sat.