Step 1: (3x + 12y) + (10x - 5y)
step 2: (3x + 12y) + (-5y + 10x)
step 3: 3x + (12y – 5y) + 10x
step 4: 3x + 10x + (12y - 5y)
step 5: 13x + 7y
steps

Right triangle lmn has vertices l(7, –3), m(7, –8), and n(10, –8). the triangle is translated on the coordinate plane so the coordinates of l’ are (–1, 8). (x, y) → (x + 6, y – 5) (x, y) → (x – 6, y + 5) (x, y) → (x + 8, y – 11) (x, y) → (x – 8, y + 11)