Please help! How do you find an exponential equation of best fit using a table?

At his new job, jeremiah can choose an hourly rate of $9 plus a $50 weekly bonus for opening the store, or an hourly rate of $10 per hour with no opening bonus. the equations model his salary options. y = 9x + 50 y = 10x

He concluded that a heavier object dropped from the same height as a lighter object will land

What is the result of adding the system of equations? 2x+y=4 3x-y=6