A biologist measures and records the height of two plants at the end of each day. After several days, the blologist determines that each plant's daily height can be represented by these equations • Plant #1: h=2.5d + 10.0
• Plant #2: h=2.5d + 7.5
In both equations, d represents the day and h the height of the plant in millimeters. The scientist wants to know when the plants will be the same height. By looking at the two equations and
without graphing or solving algebraically, when will the plants be the same height? Explain your answer.