16. What do you call the horizontal number line in the Cartesian plane? C. origin B. y-axis D. quadrant A. X-axis ? 17. The coordinates for the origin in the coordinate plane are C. (1,1) B. (0,0) D. (1.0) A. (0,1) D. 6x-8y+7=0 18. Point (-7.-5) is located in which quadrant? C. III B. II DIV Α.Ι 19. Which of the following linear equations in two variables is written in standard form? A. 2y = 3x-4 B. 5x =7 - 4y C. x-y=11 20. What will be the value of B in the equation 3x-By=15 if x=4 and y=3? A-9 B.-1 C. 1 D.9 21. Which equation below satisfies the ordered pair (-2,-7)? A. 2y=x+17 B. 5x=12-y C. 11x-y=-15 D. 10x+2y=34 22. Given the points (3,2) and (-5,2), find the slope of the line. A-8 B. O C. 1 D. undefined 23. Given the points (-4,3) and (-4.5), find the slope of the line A. -8 B. O C. D. undefined 24. The vertical change between two points is called А. up B. run C. down D. rise​