Students graphed the growth rate over several weeks of two plants in their classroom. the equations of both plants are given where x represents the time in weeks and y represents the heights of the plants in inches.
plant a: y = 1.8x + 3.1
plant b: y = 2.3x + 1.9
approximately how many weeks will it take for both plants to reach the same height? round your answer to the nearest tenth.
1.9 weeks
2.4 weeks
3.1 weeks
7.4 weeks