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 .
An example of a variation equation would be the formula for the area of the circle: . In the language of variation, the area A varies directly with the square of the radius r ; the constant of variation is. This formula is an example of direct variation. Direct variation means that, in the one term of the formula, the variable is on top.