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In Exercises 1-5, copy and complete the statement with always, sometimes, or never. 1. A function is a relation. 2. A relation is a function. 3. The graph of a vertical line represents a function. 4. The first coordinate of an ordered pair is a number in the domain. 5. For each input value of a function, there is more than one output value. In Exercises 6-10, graph the line. On the same grid, write the equation for (a) the line passing through (2, 1) that is parallel to the original line in point-slope form, and (b) the line perpendicular to the original line passing through (1, -3) in slope-intercept form. 6. y = 7x +2 7. y = 3x + 10 0-20, 10 8. y = 5/3 x =12 9. x + 2y = 8 10. 2x - 4y = 24 In Exercises 11-15, write an equation of the line that passes through the given points in standard form. 11. (4, 7), (3, 4) 12. (22, 3), (2, 25) 13. (25, 24), (27, 6) 14. (0, 2), (22, 21) 15. (4, 21), (2, 22)