eq1: (4 * x) + (2 * y) + (3 * z) = 1
eq2: (2 * x) + y + (3 * z) = 2
f = IntersectPath(eq2, eq1)
p = 1 (slider from -5 to 5, step 1)
eq3: (4 * x) + (2 * z) = 2 + p
g = IntersectPath(eq1, eq3)
h = IntersectPath(eq2, eq3)
A: (p / 4, (-1 / 2 * (p + 2)), 1)