Your question is incomplete... proportional to WHAT?
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In order to determine if two sets of numbers are proportional, you need to compare their ratios. For 7 and 9, the ratio is 7/9, which simplifies to 0.777. For 70 and 90, the ratio is 70/90, which simplifies to 0.778. Since these two ratios are not equal, 7 and 9 are not proportional to 70 and 90.
Yes. It is inversely proportional. An increase in x results in a proportional decrease in y and vice versa.
You CAN'T determine whether two numbers are proportional, just by looking at one number from each set.
9 over 16 is the same as 9 divided by 16: 9 ÷ 16 = 0.5625
Expressed as a decimal, 16/9 = 1.7 recurring (that is, 1.7777...)