Which of these strategies would eliminate a variable in the system of equations?

10x+4y=-2
5x-2y=2

A) Multiply the top equation by 1/2, than add the equations

B) Multiply the bottom equation by 2, then subtract the bottom equation from the top equation.

C) Add the equations.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

i think the answer would be c

multiply then divide

step-by-step explanation: