Find the image of (1,2) after a reflection about x =3 followed by a reflection about x=7

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Write a story that matches with the expression 42x-5 pls hurry

What is the reflection image of (5,-3) across the line y = -x?