What is the solution to the following system of equations?
y = −x2 − 5x − 4
y = −x2 + 9x − 18

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).

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Free points also plz look my profile and answer really stuff