What is the X intercept of the equation y-1= -(x+5)?

Which expression is equivalent to sq-80

X+ y = 5 ; x - y =3 solve using linear combination

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)