Tanica drew a line of best fit on a scatterplot, as shown below. On a graph, a trend line has a negative slope. The equation of the line is y almost-equals negative 1.02 x 7.09. Using the line, she predicted that when the value of x is 0.5, the value of y will be approximately 7.6. What was her mistake? She drew the line of best fit incorrectly. She used the line of best fit to predict y for an incorrect value of x. She forgot the minus sign before the first term on the right side of the equation when she predicted y. She plugged 0.5 into the equation for y instead of x and actually predicted x instead of y.