Can all problems be represented on a graph and why

Match the linear equations with their x- and y-intercepts. (-20/3, 0) and (0, 4) (3, 0) and (0, -21) (-15/3, 0) and (0, 4) (-7/3, 0) and (0, 7/3) (2, 0) and (0, -1) equation intercepts x − 2y = 2 -3x + 3y = 7 7x − y = 21 3x − 5y = -20