The coordinate grid shows the graph of four equations: a coordinate grid is shown from negative 12 to positive 12 on the x axis and also on the y axis. line a passes through the ordered pairs negative 3, 4 and 9, negative 2. line b passes through the ordered pairs 2, 8 and 8, negative 8. line c passes through the ordered pairs negative 3, negative 4 and 4, 6. line d passes through the points 2, negative 2 and 5 and 6. which set of equations has (3, 1) as its solution? a and b c and d b and d a and d