Billy's plant grows at least 2 inches a month.

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Step-by-step explanation:

Here we are given that the plant growth is fixed by 2 inches for every month.

hence ,

if we assume that the plant had zero height at beginning , when the time was also zero, then in the next month that is 1st month the height of the plant will be 2 inches, similarly in the 2nd month the height will be 4 inches , for the third month the height of the plant will be 6 inches and so on.

So, if we plot them on a graph , taking time in month on x axis and height of the plant on y axis , the pattern of growth as mentioned above will give us few coordinates like,

(0,0) , (1,2) , (2,4) , (3,6) and so on..

hence from here we can determine equation which refers the above situation by using two point form of an equation . The two point form is given as

where

and are and respectively

substituting them in the above formula we get

Hence we get out scenario , in equation as

Note:

this is the situation when the height of the plant was considered 0 at time 0 . however , if the initial height of the plant was k ( assumption )

The equation would have been like this

This is because in both the cases the slope of the line would be same , as slope represents the rate of increase of y with respect to x . in this case it would be the increased in the height of the plant with respect to the months Where k represent the value of y at x= 0 , or the height of the plant at time 0 month.

Please refer to the image attached with this.

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step-by-step explanation: