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Name: ________________________ Class: ___________________ Date: __________ ID: A Quest - Exam - Review - Sections 8.1-8.4 8. y = −3x − 9; ÊÁË 5, a ˆ˜¯ Tell whether the relation represented by the graph is a function. 9. 2x + 7y = −5; ÊÁË a, 1 ˆ˜¯ 1. 10. 5x − 6y = 23; ÊÁË a, − 3 ˜ˆ¯ Find the slope of the line through the given points. 11. (34, 15), (16, 30) 12. (9, 14), ÁÊË −7, − 6 ˜ˆ¯ 2. 13. ÊÁË 36, − 5 ˆ˜¯ , ÊÁË 6, 5 ˆ˜¯ Identify the slope and y-intercept of the line with the given equation. 14. 3x + 2y = 5 3. 15. 4x − 10y = −9 16. −x + 5y = 8 17. Write an equation of the line that is parallel to the line y = −x + 4 and passes through the point (0, 10). 18. Write an equation of the line that is perpendicular to the line y = 2x − 1 and passes through the point ÁÊ 0, − 3 ˜ˆ . Ë ¯ Write the equation in function form. 4. 3x + 5y = −10 5. 6y − 4x = 24 6. −x − 4y = 10 Find the value of a that makes the ordered pair a solution of the equation. 7. y = x + 11; ÊÁË −1, a ˆ˜¯ 1 Name: ________________________ ID: A 2 20. y = − x − 2 3 Find the intercepts of the equation's graph. Then graph the equation on the given coordinate grid. 19. 1.8x + 1.5y = 9 21. The table below shows an employee's hourly wage over 25 years with a company. Show that the table represents a linear function by making a scatter plot on the grid. Then write an equation for the function. Time (in years), x Hourly wage (in dollars), y 0 9.5 5 12 10 14.5 2 15 17 20 19.5 25 22 ID: A Quest - Exam - Review - Sections 8.1-8.4 Answer Section 1. function 2. not a function 3. function 3 4. y = − x − 2 5 2 5. y = x + 4 3 1 5 6. y = − x − 4 2 7. 10 8. −24 9. −6 10. 1 5 11. − 6 5 12. 4 1 13. − 3 3 5 14. m: − ; y-intercept: 2 2 2 9 15. m: ; y-intercept: 5 10 1 8 16. m: ; y-intercept: 5 5 17. y = −x + 10 1 18. y = − x − 3 2 19. x-intercept: 5, y-intercept: 6; 1 ID: A 20. x-intercept: −3, y-intercept: −2; 1 21. y = − x + 9.5; 2 2