I need help with the following question about magnetic fields

One infinite straight wire is placed on the x-axis and carries a constant current I, another infinite straight wire is placed on the y-axis and carries a constant current /2. I, flows towards the +x direction, whereas 12 flows towards the -y direction. a) Find the magnitude of the magnetic field at an arbitrary point (x, y) on the plane. b) Assume that /1 = 12, identify the regions on the xy-plane that have the magnetic field pointing into the page