Determine the value of k so that equations x^2+kx+k-1=0has exactly one real root

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The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

What is the equation in slope-intercept form of the linear function represented by the table? y -18 -1 -8 4 2 912 o y=-2x-6 o y=-2x+6 o y=2x-6 o y = 2x+6