Answer
y=2.6x
y=31.2 when x=12
Work Step by Step
Since the general form of a direct variation is y=kx, we can substitute the coordinate given to us into this equation in order to find the value of k:
10.4=4k (Divide both sides by 4)
2.6=k
Now plug this value of k into the standard equation of a direct variation:
y=2.6x
In order to find the value of y when x=12, substitute the value of x into the equation above:
y=2.6(12) (Simplify)
y=31.2
