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### Question Asked by a Student from EXXAMM.com Team

** Q 2203356248. ** If `vec(a)` and `vec(c)` care non-collinear, then the point of intersection

of the line `vec(r) = 6 vec(a) - vec(c) + lambda (2 vec(c) - vec(a) )` and

`vec(r) = vec(a) -vec(c) + mu ( vec(a) + 3vec(c) )` is `3 vec(a) + 4 vec(c)`