B x C rational or irrational

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

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.