Xy
1 1
2 4
3 9
4 16

does the table represent x as directly proportional to y? why or why not?
a) no, because the y-values are not increasing at a constant rate.
b) yes, because the x- and y-values are increasing proportionately.
c) no, because the y-values are increasing faster than the x-values.
d) yes, because each y-value is the square of the corresponding x-value.