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1. what is the definition of a function in algebra?

2. which one of the sets below is a function? explain why.

(3,3) (4,4) (5,5) (6,6) or (1,6) (2,6) (3,4) (2,8)

3. what is slope-intercept form?

4. in the equation y = -2x + 6 identify the slope and y-intercept

5. what is the slope and equation of a horizontal line and a vertical line?