Do the ratios 10:9 and 17:15 form a proportion?

Nope! these ratios do not form a proportion

Step-by-step explanation:

if you use a calculator to divide 10/9, you get 1.111 repeating.

if you use a calculator to divide 17/15, you get 1.133 repeating.

since 1.111 does not equal 1.113, these ratios are not proportional.

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-2

7 - 9 = -2

reversed:

-2 + 9 = 7