If - 2x ^ 2-5M + 1 = 0 is a univariate linear equation about X, then M =?

If - 2x ^ 2-5M + 1 = 0 is a univariate linear equation about X, then M =?

If the equation is a linear equation with one variable, it should have a real root, that is to say, the quadratic equation with one variable has two equal real roots
So let △ = 0
That is: 0 - 4x (- 2) x (- 5m + 1) = 0
The solution is m = 1 / 5

Is 5 (M & # 178; - 1) = 1-5m & # 178; a linear equation of one variable

An unknown number is unary, the highest power is 2, so it is unary quadratic

It is known that (Y & # 178; - 1) x & # 178; + (y + 1) x + 4 = 0 is a linear equation of one variable with respect to X. if a > 1, then the value of / Y-A / + / A-X / is ()
It is known that (Y & # 178; - 1) x & # 178; + (y + 1) x + 4 = 0 is a univariate linear equation about X. if a > 1, then the value of / Y-A / + / A-X / is (). A.3 B. - 3 C. - 2a-1 d.2a + 1

A:
It is known that (Y & # 178; - 1) x & # 178; + (y + 1) x + 4 = 0 is a linear equation of one variable with respect to X
Then:
y²-1=0
y+1≠0
The solution is y = 1
So: the equation is 2x + 4 = 0
The solution is: x = - 2
Because: a > 1 = Y > x = - 2
So:
|y-a|+|a-x|
=a-y+a-x
=2a-1-(-2)
=2a+1
Select D