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 .
Interpretation according to the definition of direct variation: When the radius (the independent variable) is doubled, the circumference (the dependent variable) is also doubled. This is how the relationship of the variables C (circumference) and r (radius) is described in direct variation. I hope that you realize that it's not just y=kx. If you know the key phrases and the definition (and the relationship), you can solve real-life situation problem involving direct variation.