Example 1 State whether each equation or function is a linear function. Write yes or no. Explain. 10. 3y - 4r = 20 11. y=1-6 12. h(x) = 6 13. (x) = 2r + 4r + 1 14. g(x) = 5+ 9 15. (x) = V7-1 16. 4r + vy = 12 17. + 1 =1 18. AN= + Example 2 19. CARS Two cars are waiting at a stoplight. The graph and the table Car A show how the speeds of the two cars change over time after the light turns green. State whether each function is a linear function. Explain. 39 Car B Time Is D 1 2 3 4 5 Speed (mi/hi Speed (michi D B 16 24 32 Examples 3-4 State whether each graph has line symmetry or point symmetry. 0 123 45 If so, identify any lines of symmetry or points of symmetry. Time ($) 20. of 22 23