How?? If y varies directly with x and y = -7 when x = -1, find x when y = -84. Find the rate of change for 2000 to 2010 given these ordered pairs in the data set: (2000, 286) and (2010, 192). Write your answer as a decimal.

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How?? If y varies directly with x and y = -7 when x = -1, find x when y = -84. Find the rate of change for 2000 to 2010 given these ordered pairs in the data set: (2000, 286) and (2010, 192). Write your answer as a decimal.

Mathematics
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\[y=kx\] \[-7=k(-1)\] \[k=7\] \[y=7x\] \[-84=7x\] \[-12=x\]
For the second question: to find the slope, subtract the y values then subtract the x values. Put the first number over the second number. That is the slope.
(286-192)/(2000-2010)=94/-10=47/-5

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