byx​ and bxy are two regression coefficients. If byx>1, then bxy​ will be –

The product of the two regression coefficients b_yx and b_xy is equal to the square of the correlation coefficient, i.e., b_yx * b_xy = r^2. Since the square of a real number is always non-negative (r^2 >= 0), both regression coefficients must have the same sign. Therefore, if b_yx > 0, then b_xy must also be positive.