Write the equation of the line with slope -2 through the point (7,-1).
y = -2x + 13
y = -2x - 15
y = -2x + 15
y = -2x - 13

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .

If 3x+8=3x+8 is it one solution or no solution

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.