Answer:Your answer would be -8 x - 17 y
Step-by-step explanation: x - 9 x would be - 8 x
You would have to distribute the negative in the problem -(9 x- 8 y) which would make it -9 x +8 y and 9 y + 8 y is 17 y so there fore the answer is -8 x - 17 y
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