Which description does not guarantee that a trapezoid is isosceles??

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle

Solve the following system of equations express your answer as an ordered pair in the format (a,b) with no spaces between the numbers of symbols 5x+2y=22