5x + 9y = 31 -------------(1)
-2x - y = 11 ---------------(2)
Multiply through equation (2) by 9
-18x - 9y = -99---------------(3)
Add equation(1) and (2)
-13x = -68
Divide both-side by -13
x = 5.23
Substitute x in equation(1) and solve for y
-2(5.23) - y = 11
-10.46 - y = 11
