Which ordered pair is the solution to the system of equations?

{2x +y = −8
{x− y = −4

a. (−1, 3)(−1, 3)

b. (−4, 0)(−4, 0)

c. (−3, −2)(−3, −2)

d. (1, 5)

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).

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