For Mandy's van equation,
y = 0.28 x + 37. 50
comparing with Veronica, Difference
when x = 20, y = 0.28 ( 20 ) + 37. 50 = 43.1 y = 58. 40 58.40 - 43. 1 =15. 3 ( CORRECT)
when x = 55, y = 0.28 ( 55 ) + 37. 50 = 52.90 y = 64. 35 64. 35 - 52.90= 11.45
when x = 120, y = 0.28 ( 120 ) + 37. 50 = 71. 1 y = 75. 40 75.40 - 71.1 = 4.3
For Veronica's van Table of values,
when x = 20 , y = 58. 40
when x = 55, y = 64. 35
when x = 120, y = 75. 40