Question 355448
Multiply the bottom equation by 5, with the purpose of eliminating x.  Then we get 5x -10y = -30.  Add corresponding sides with the top equation, to get
12y - 10y = 20 - 30, or 2y = -10, or y = -5.  Use the bottom equation to solve for x:
x - 2(-5) =  -6, or x + 10 = -6, or x = -16.  Therefore the solution is the ordered pair (-16, -5).