Explain or show that the point (5,-4) is a solution to this system of equations

You are remodeling your kitchen. you’ve contacted two tiling companies who gladly told you how long it took their workers to tile of a similar size jim completed half the floor in 8 hours. pete completed half of the other floor in 7 hours. if pete can lay 20 more tiles per hour than jim, at what rate can jim lay tiles

Ihave trouble finding the nth term of a linear sequence

Which expression gives you the distance between the points (5,1)and(9,-6)