}

a = 1.8 (slider from -10 to 10, step 0.1)
b = -0.9 (slider from -10 to 10, step 0.1)
c = -4.2 (slider from -10 to 10, step 0.1)
d: (a * x) + (b * y) = c
a' = -0.7 (slider from -10 to 10, step 0.1)
b' = -1 (slider from -10 to 10, step 0.1)
c' = -2.1 (slider from -10 to 10, step 0.1)
e: (a' * x) + (b' * y) = c'
A = Intersect(d, e)
texto1: "" + a + " x + " + b + " y = " + c + ""
texto2: "" + a' + " x + " + b' + " y  = " + c' + ""