Given A= -7,B=13 and C=53 what is the the standard form of an equation

Which value of c would make he following expression completely factored? 8x+cy

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.

I’m really confused and need your assist me with this question i’ve never been taught