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-4x+3y=21, where x is time and y is velocity in kilometers per hour. Use this function to determine when a certain particle will reach 30km/hr.
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-4x+3y=21, where x is time and y is velocity in kilometers per hour. Use this function to determine when a certain particle will reach 30km/hr.

User Matthes
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the answer is X= - 3(7 - Y)
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User Bspoel
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