Answer
(2.6, 1.3)
Work Step by Step
To solve a system with a calculator you need transform the equations into this form: ax+by=c
$ y=5.1x+14.56 <=>-5.1x+y=14.56$
$ y=- 2x-3,9 <=> 2x+y=-3.9$
After that you can insert these into the calculator and it will solve the system.