PHP - Laravel :How to Update the database from different model using laravel controller?

Here the scenario is, I have 3 tables : 1. Teacher. 2. Course. 3. Course Assign to Teacher

In teacher table there is two columns name: credit_taken and remaining_credit (default 0) and in course there is course_credit column. So here is problem, In course Assign to Teacher when a teacher take a course the equation would be like remaining_credit=credit_taken -course_credit

I have done the solution but instead of value update in database it's creating new teacher row in teachers table.

Here is my controller:

 public function postcourseAssignTeacher(Request $request)
    {
            $assignTeacher = new AssignTeacher();
            $assignTeacher->teacher_id=$request->Input(['teacher_id']);
            $teacher->credit_taken = $request->Input(['credit_taken']);
            $teacher->remaining_credit = $request->Input('remaining_credit');
            $assignTeacher->course_id = $request->input('course_id');
            $course->name=$request->Input('name');
            $course->credit=$request->Input('credit');
            $teacher->remaining_credit=$teacher->credit_taken -$course->credit;
            $assignTeacher->save();
        //    $course->save();
            $teacher->update();
            return redirect('courseAssignTeacherPage');
    }

How do I update above two columns in teacher table?

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