#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
template <class T>
using vc = vector<T>;
template <class T>
using vvc = vc<vc<T>>;
template <class T>
using vvvc = vc<vvc<T>>;
#define overload5(a, b, c, d, e, name, ...) name
#define overload4(a, b, c, d, name, ...) name
#define overload3(a, b, c, name, ...) name
#define rep1(n) for (ll i = 0; i < n; ++i)
#define rep2(i, n) for (ll i = 0; i < n; ++i)
#define rep3(i, a, b) for (ll i = a; i < b; ++i)
#define rep4(i, a, b, c) for (ll i = a; i < b; i += c)
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep1(n) for (ll i = n; i--;)
#define rrep2(i, n) for (ll i = n; i--;)
#define rrep3(i, a, b) for (ll i = b; i-- > (a);)
#define rrep(...) overload4(__VA_ARGS__, rrep4, rrep3, rrep2, rrep1)(__VA_ARGS__)
#define each1(i, a) for (auto &&i : a)
#define each2(x, y, a) for (auto &&[x, y] : a)
#define each3(x, y, z, a) for (auto &&[x, y, z] : a)
#define each4(w, x, y, z, a) for (auto &&[w, x, y, z] : a)
#define each(...) overload5(__VA_ARGS__, each4, each3, each2, each1)(__VA_ARGS__)
#define all1(i) begin(i), end(i)
#define all2(i, a) begin(i), begin(i) + a
#define all3(i, a, b) begin(i) + a, begin(i) + b
#define all(...) overload3(__VA_ARGS__, all3, all2, all1)(__VA_ARGS__)
#define rall1(i) rbegin(i), rend(i)
#define rall2(i, a) rbegin(i), rbegin(i) + a
#define rall3(i, a, b) rbegin(i) + a, rbegin(i) + b
#define rall(...) overload3(__VA_ARGS__, rall3, rall2, rall1)(__VA_ARGS__)
template <class T>
bool chmin(T &a, const T &b) {
    if (a <= b) return 0;
    a = b;
    return 1;
}
template <class T>
bool chmax(T &a, const T &b) {
    if (a >= b) return 0;
    a = b;
    return 1;
}
template <class T, class U>
bool chmin(T &a, const U &b) {
    return chmin(a, (T)b);
}
template <class T, class U>
bool chmax(T &a, const U &b) {
    return chmax(a, (T)b);
}
void solve();
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    ll t = 1;
    cin >> t;
    for (int i = 1; i <= t; i++) solve();
    return 0;
}
ll dy[] = {0, 0, 1, 0, -1}, dx[] = {0, 1, 0, -1, 0};
// ll dy[8] = {1, 1, 0, -1, -1, -1, 0, 1}, dx[8] = {0, 1, 1, 1, 0, -1, -1, -1};
void solve() {
    ll n, k;
    cin >> n >> k;
    vc<pair<ll, ll>> v(n);
    vc<ll> days;
    rep(n) cin >> v[i].first >> v[i].second, days.push_back(v[i].first);
    sort(all(v));
    sort(all(days));
    days.erase(unique(all(days)), days.end());
    ll cur = 0, las = 0;
    ll idx = 0;
    for (auto x : days) {
        cur += k * (x - las);
        las = x;
        while (idx < n and v[idx].first == x) cur -= v[idx].second, idx++;
        if (cur < 0) {
            cout << "No" << endl;
            return;
        }
    }
    cout << "Yes" << endl;
}