Look at the graph below: first line joins ordered pairs negative 4, 3 and 2, negative 3. second line joins negative 4, negative 3 and 2, 3. part a shaded above first and second line. part b shaded below first line and above second line. part c shaded below first and second lines. part d shaded above first line and below second line. which part of the graph best represents the solution set to the system of inequalities y ≥ x + 1 and y + x ≥ −1? a). part a b). part b c). part c d). part d