This means that the x value of the new triangle is 19 more than the x value of the original triangle, and the y value stays the same. So point G will now be (-6 + 19, -4.5) or (13, -4.5). Point H will be (-10 + 19, -8) or (9, -8) and point I will be (-6 + 19, -14) or (13, -14)
And dont forget about the reflectiona cross the x axis, which just flips it across that line