Find the value of x or y so that the line through the points has the given slope of (x, -8) and (-7,5); slope: -13/7

Ineed to know the answer to this algebra question.

Solve the equation. 2x - 8(x+1)= 6(2x - 3)

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?