Answer:
x - y = 9
Step-by-step explanation:
When x goes up by 1, y goes up by 1. That means there is a constant difference between the values. That difference is x1 -y1 = 1 -(-8) = 9.
An equation relating the values is ...
x - y = 9
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Some folks like to see the relation in "y =" form. You can add y-9 to both sides to get that form:
y = x -9
