Please help with these pre-calc questions im so lost

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

How do you solving the solution of each system using elimination?

What is a correct first step in solving the inequality-4(3-5x)> -6x+9