How to resolve the dependency on Microsoft.EntityFrameworkCore.SqlServer and Microsoft.EntityFrameworkCore.Tools?

I am trying to create an application using Microsoft SQL Server database using Entity Framework Core.

This is what I have done so far

Step 1: From Nuget Package manager I have installed: Install-Package Microsoft.EntityFrameworkCore.SqlServer

Step 2: From Nuget Package manager I have installed (for Entity Framework commands) : Install-Package Microsoft.EntityFrameworkCore.Tools –Pre

And my project.json looks as under

{
  "version": "1.0.0-*",
  "buildOptions": {
    "emitEntryPoint": true
  },

  "dependencies": {
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.1",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview3-final",
    "Microsoft.NETCore.App": {
      "type": "platform",
      "version": "1.0.0"
    }
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": "dnxcore50"
    }
  }
}

But it throws error

a) The dependency Microsoft.EntityFrameworkCore.SqlServer >= 1.0.1 could not be resolved. b) The dependency Microsoft.EntityFrameworkCore.Tools >= 1.0.0-preview3-final could not be resolved.

Screen shot

I am using

• VS 2015 Update 3
• Not net framework 4.6.1

Why it is throwing the error and how can i fix it?