Find an equation y = mx + b that models the quantity y after x units of time.A quantity y is initially -30 and increases at a rate of 4.3 per minute.
A. y = -4.3x - 30
B. y = -30x - 4.3
C. y = -30x + 4.3
D. y = 4.3x - 30
Answer: D
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