Not possible. They do not have any video in ports to connect each other. The Inspiron 3048 only has an HDMI out port which would be used to connect a monitor or TV.
They can be connected to a single monitor by means of what's called a KVM (keyboard-video-mouse) switch).
Or, if on a network, remote control software can be used to run one system from another (Windows Pro and Enterprise required for outbound connections, so at least one system must be running Pro/Enterprise). All recent versions of Windows support inbound connections.