
#include<iostream>
#include<cmath>

using namespace std;
#define EPS 0.0000001
int main(){

	int n; cin >> n;
	double x1,x2,x3,x4,y1,y2,y3,y4; //??\????????§?¨?

	for(int i=0;i<n;i++){
		cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3 >> x4 >> y4;
		if( abs((y1-y2)*(x4-x3) + (x1-x2)*(y3-y4)) < EPS  ){
			cout << "YES" << endl;
		}else{
			cout << "NO" << endl;
		}
	}
	return 0;
}