
#include<iostream>
#include<cmath>
#include<cstdio>
#include<algorithm>

using namespace std;

int main(){

	int n; cin >> n;
	double x[4],y[4]; //??\????????§?¨?

	for(int i=0;i<n;i++){
		for(int j=0;j<4;j++){
			cin >> x[j] >> y[j];
		}

		if( (y[0]-y[1])*(x[3]-x[2]) + (x[0]-x[1])*(y[2]-y[3])  == 0){
			cout << "YES" << endl;
		}else{
			cout << "NO" << endl;
		}

	}
	return 0;
}