Please help me i need it

Matt and brian were solving a system of equations. they both noticed that the two lines had the same slope. brian said that because each line in the system had the same slope, the two lines had to be parallel, which meant the solution to the system was "no solution" matt disagreed, and said they should also look at the y-intercepts before determining how many solutions there were. who is correct?

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 solution to this system of equations? y= 2x - 3.5 x - 2y = -14