If y varies directly with the square of x and y = 4.3 when x = 5, what is the value of y when x = 6?
A) 0.2
B) 3.0
C) 5.2
D) 6.2
E) 209.3
Direct variation (aka direct proportionality) means that the ratio of the two variables will always be the same. In this case, .
Once you have that set up, you can solve fairly simply by plugging in the values you’re given:
Round it and you land on D.