A system of equations has infinitely many solutions. If 2y – 4x = 6 is one of the equations, which could be the other equation? y = 2x + 6
y = 4x + 6
–y = –2x – 3
–y = –4x + 6

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?