#5: This is a function. It passes the vertical line test.
#6: This is not a function. It does not pass the vertical line test. For example, x=0 has six y-values paired with that one x-value. A function that does not make.
#7: This passes the vertical line test.
The answer should be 421.034904 if you’re not rounding
D.
it is a linear function as each time x increases by 1, y increases by 18
