A linear equation is modified so that the rate of change is tripled, but the y-intercept remains the same. Which pair of equations could represent the original equation and the modified equation?
A. y=x+3 and 3y=3x+9
B. y=9x-2 and y=12x-2
C. y=-2x-3 and y=-2x-9
D. y=-5x+6 and y=-15x+6
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