What point is located on the x-axis

Pls help

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

What is the slope of the line (-7,2) (4,6)

Asporting good store is offering 30 percent off of the original price(x) of football cleats. the discount will be reduced by an another $7 before sales tax.