If x={1,2,3}x = \{1, 2, 3\}x={1,2,3} and y={2,4,6}y = \{2, 4, 6\}y={2,4,6}, what is the equation of the regression line?
y^=x\hat{y} = xy^=x
y^=2x\hat{y} = 2xy^=2x
y^=x+1\hat{y} = x + 1y^=x+1
y^=3x−1\hat{y} = 3x - 1y^=3x−1