Helppp and explain pls and thankyou ,I will mark brainlist

How many solutions does the nonlinear system of equations graphed below have?

Atriangle has verticals at b(-3,0), c(2,-1), d(-1,2). which transformation would produce an image with verticals b”(-2,1), c”(3,2), d”(0,-1)?

What rotation was applied to triangle def to create d’e’f’?