Which expression represents a perfect square monomial and it’s square root? Check all that apply

121; 11

4x^2; 2x

9x^2-1; 3x-1

25x; 5x

49x^4; 7x^2

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.