with(plots); implicitplot({2*x+3*y=5,3*x-y=2},x=-5..5, y=-5..5); y1:=solve(2*x+3*y=5,y); eq2:=subs(y=y1,3*x-y=2); x2:=solve(eq2,x); subs(x=x2,y1); solve({2*x+3*y=5,3*x-y=2},{x,y}); with(LinearAlgebra); A1:=Matrix([[2,3],[3,-1]]); Determinant(A1, method=minor); plot(x^2-x-6,x=-5..5); solve({x^2-x-6=0},x);