#include <stdio.h>
#define sqr(a) (a) * (a)

int main(void){
	int n, i;
	double x1,x2,x3,x4,y1,y2,y3,y4;
	scanf("%d",&n);
	for(i = 0;i < n;i++){
		scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
		double left = (sqr(x2 - x1) + sqr(y2 - y1)) * (sqr(x4 - x3) + sqr(y4 - y3));
		double right = sqr((x2 - x1) * (x4 - x3) + (y2 - y1) * (y4 - y3));
		if(left == right || -left == right){
			printf("YES\n");
		}else{
			printf("NO\n");
		}
	}
	return 0;
}