For this system, y1 ′ = 2y1 − 4y2
y2 ′ = y1 − 3y2
y1 (0) = 3
y2 (0) = 0
h = 0.1

Solve in MATLAB or VBA and plot with 10 steps.

a. Eulers
b. Runge-Kutta

What do you mean? It mainly depends on what polygon you are looking at. But if you are looking at a polygon and want to know if it's congruent, then just picture yourself folding the polygon in half. If there is pieces sticking out, then it is not congruent, but if it aligns perfectly, then it is congruent.