#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n, x;
    cin >> n >> x;
    ;
    int a[n];
    int b[n];
    for (int i = 0; i < n; i++) {
      cin >> a[i];
      cin >> b[i];
    }
    reverse(b, b + n);
    bool ans = 1;
    for (int i = 0; i < n; i++) {
      if (a[i] + b[i] > x) {
        ans = 0;
        break;
      }
    }
    if (ans)
      cout << "Yes" << endl;
    else
      cout << "No" << endl;
  }
  return 0;
}
