Δx=

\frac{Δy}{Δx} = m

\quad n_{}

m = 0.7000000000000002 (slider from -5 to 5, step 0.1)
n = 2.1000000000000005 (slider from -4 to 4, step 0.1)
f(x) = m x + n
A = Point(xAxis)
B = Point(f)
Δy = Segment(A, B)
C = Intersect(f, xAxis, 1)
Δx = Segment(A, C)
E = Intersect(f, yAxis, 1)
D = Intersect(xAxis, yAxis)
n_2 = Segment(E, D)
Δx_1: x(A) - x(C)
F = Root(f(x))
text2: Δx_1 + ""