Menciona dos semejanzas entre los triángulos escalenos e isósceles.

A scalene triangle has no two sides that are equal. This makes the three angles also unequal. An isosceles triangle has at least two equal sides. The angles opposite the equal sides are also equal.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.