Pre Algebra: Slope, Rate of Change?

Fo my pre algebra class, I was asked to complete an input-output table, find the equation, the rate-of-change, the slope, and the y-intercept. The input-output table looks like this: 5,0; 1,4; 7, -2. To complete the table, I was asked to ad 2 other sets of numbers that follow this pattern...but not only can I NOT figure out the pattern, but I'm unsure about the other questions. While I think the slope is 4/1, I'm not sure about that either. Any explanation would be a-maz-ing!! Thanks in advance.
 
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