Is (3,5) a solution to the system - x +y = 1 and 2x + 4y = 2?

Plz which expression is equivalent to the expression below?

The conversion factor relating feet to meters is 1 ft=0.305 m. keep in mind that when using conversion factors, you want to make sure that like units cancel leaving you with the units you need. you have been told that a certain house is 164 m2 in area. how much is this in square feet?

Does the point (1, sqrt 7) lie on circle shown.