Question 1098795
<br>Direct variation means the "output" function value gets larger or smaller as the input value gets larger or smaller.  This is represented by an equation of the form {{{y = kx}}}, where k is the variation constant.<br>
If, as in this problem, you are given an x and a y value in a direct variation problem, you can find the variation constant k by plugging the given x and y values in the general form of the equation.
{{{20 = k(40)}}}
{{{0.5 = k}}}<br>
The variation constant is 0.5, or 1/2.