Which proof proves this? Legit need help!

At the many chips cookie company they are serious about the number of chocolate chips in their cookies they claim that each cookie hasn't c chips. if their claim is true there will be 200 chips in 10 cookies

Write an equation in point-slope form for the line through the given point that has the given slope (-2,-7); m=-3/2

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1