Droite non verticale

Droite verticale

m = 1 (slider from -10 to 10, step 0.1)
p = 2 (slider from -5 to 5, step 0.1)
d: y = m x + p
c = 2.2 (slider from -5 to 5, step 0.1)
d': x = c
a = false
b = false