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Mathematics, 27.10.2020 01:00 joshWash

PLZ HELP FAST 20 points A physicist working in a large laboratory has found that light particles traveling in a particle accelerator increase velocity in a manner that can be described by the linear function -4x + 3y = 21, where x is time andy is velocity in kilometers per hour. Use this function to determine when a certain particle will reach 40km/hr. The particle will reach 40km/hr when x =

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