hp dari 2x+2y=11 dan x-y=3 adalah...

x-y =3
x = y+3

2 (y+3) + 2y = 11
2y +6 + 2y = 11
4y = 5
y = 5/4

x = 5/4 + 3 
x = 17/4

HP {17/4 , 5/4}

2x+2y = 11
x-y = 3

2x+2y = 11
2x-2y = 6
_________ -
4y = 5
y = 5/4

x-5/4 =3
x = 3+5/4
x = 12/4 + 5/4
x = 17/4