When an equation in one variable is solved using
a system of equations, the solution is always the
of each intersection.
X-coordinate
Y-coordinate

  X-coordinate

Step-by-step explanation:

The problem statement assumes you want to solve ...

   f(x) = g(x)

by writing the system of equations ...

  y = f(x)

  y = g(x)

The solution will be points of intersection (x, y). The value of x is what is of interest in each case, since that is the solution to f(x) = g(x). That is, the solution is the X-coordinate of each intersection.

c is the final answer! : )

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m