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15 December, 15:07

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.

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  1. 15 December, 15:22
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    1.8x + 3.1 = 2.3x + 1.9

    1.8x - 2.3x = 1.9 - 3.1

    -0.5x = - 1.2

    x = - 1.2 / - 0.5

    x = 2.4 weeks
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