The equation (m-1) x + (m-1) y = 0 is a bivariate linear equation when m =? And a univariate linear equation when m =

（M-1)X+(M-1)Y=0,
∵M-1≠0
∴ M≠1
When m ≠ 1, (m-1) x + (m-1) y = 0 is a quadratic equation of two variables,
(m-1) x + (m-1) y = 0,
However, no matter what m equals, m-1) x + (m-1) y = 0 cannot be a linear equation with one variable

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