Suppose y varies directly with x and y = 15 and x = 5 write a direct variation equation that relates x and y what is the value of y when x = 9
The direct variation equation that relates x and y is y = kx, where k is the constant of variation.
To find the value of k, we can substitute the given values y = 15 and x = 5 into the equation:
15 = k * 5
Simplifying the equation:
k = 15/5
k = 3
So, the direct variation equation is y = 3x.
To find the value of y when x = 9, we substitute x = 9 into the equation:
y = 3 * 9
y = 27
Therefore, when x = 9, y = 27.