Equations of two lines of regression are \( 2x - 5y + 33 = 0 \) and \( 3x - 9y - 108 = 0 \). Which one is the regression line of \( y \) on \( x \)?
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To distinguish between regression lines, remember that the regression line of \( y \) on \( x \) is in the form \( y = a + bx \), and the regression line of \( x \) on \( y \) is in the form \( x = a + by \).