If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y = (-2/1)*x+1 // - (-2/1)*x+1
y-((-2/1)*x)-1 = 0
2*x+y-1 = 0
2*x+y-1 = 0 // - y-1
2*x = -(y-1) // : 2
x = (-(y-1))/2
x = (1-y)/2
x = (1-y)/2
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