9. What value of x would make y = 1 in the equation 3x + y = 47 A. - 1 B. O C. 1 D. 2 10. Which ordered pair satisfies the linear equation 2x - 3y = 47 A. (-5, -2) B. (-5, 2) C. (5,-2) D. 15.2 11. Which of the following lines is the steepest? A. y = -5x + 3 B. C. y = 4x - 1 D. y = -2x + 6 12. What is the slope of the line that passes through points (2, -1) and D C. 4 A. O B. -4 B. y-x-1 3 3 4 4 13. Find the slope of a line through (-3, 4) and (5,-2) A. O B. C. 2 14. Find the slope of the equation y -8. A. O B. -8 C. 8 8 15. Which equation has an undefined slope? 지 = 0