1 Derivan Oil Based Patina has now been discontinued and no longer in production. 2  Derivan CanvasJack, a unique artist quality range of stretched canvases and tensioning system. 3  Our Face & Body range has just being expanded with new Face Paint Markers and Wipes. Add even more fun to your face painting. 2  Derivan continues to expand its range of artists materials with the new, professional artist grade, Derivan Watercolours range. 3  Three new colours extends Derivan Block Ink range. 4  Just released, MM32 Light Modelling Paste a NEW modelling compound added to Matisse Mediums range.
You can think of the formula for finding the vertex of a quadratic function as being (x, y) = [(-b/2a), f(-b/2a)] . This just means that to get the y value, you have to find the x value based on the formula and then plug it back into the equation. Here's how you do it: 1  y = x 2 + 9x + 18.
This is done by substituting the values of x and y into the equation for a direct varition and then solving for k. Example 1 will describe show how to find k. Example1: The point (2, 8) is a point on the graph of a direct variation. Find the constant of variation. We start with the equation: y = kx. The point (2, 8) tells us that x = 2 and that y = 8. Next, substitute these values into the equation to get: 8 = 2k.