Solve the system of linear equations by using the substitution method. Descibe the process you used and the final answer. {5x+y=152x+y=12

What is the value of x? enter your answer in the box. photo attached.

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On this question. a hypothermia occurs when a person's body temperature drops below 95 degrees fahrenheit. write and solve an inequality that describes how much lower the body temperature of a person with hypothermia will be than the body temperature of a person with a normal temperature of 98.6 degrees fahrenheit