The graph and accompanying table shown here display 12 observations of a pair of variables (x, y).

The variables x and y are positively correlated, with a correlation coefficient of r = 0.97.

You estimate the slope of the least squares regression line, y = a + bx, for these data values to be b = 2. What is the y-intercept, a, of the least squares regression line? Round your answer to the nearest tenth.
X-3,6,8,9,9,13,15,18,20,21,23,23
Y-9,17,15,15,18,24,29,36,43,39,46,55

Question

The graph and accompanying table shown here display 12 observations of a pair of variables (x, y).

The variables x and y are positively correlated, with a correlation coefficient of r = 0.97.

You estimate the slope of the least squares regression line, y = a + bx, for these data values to be b = 2. What is the y-intercept, a, of the least squares regression line? Round your answer to the nearest tenth.
X-3,6,8,9,9,13,15,18,20,21,23,23
Y-9,17,15,15,18,24,29,36,43,39,46,55