x + 2y = 5 x - 3y = -10

x + 2y = 5
x - 3y = - 10
------------------(-)
5y = 15
y = 3
x + 2y = 5
x + 2(3) = 5
x + 6 = 5
x = 5 - 6
x = - 1
hp = {-1,3}

eliminasi x
x + 2y = 5
x - 3y = -10
dikurangi menjadi
5y = 15
y = 15/5
y = 3

subtitusi y = 3 ke x + 2y = 5
maka :
x + 2(3) = 5
x + 6 = 5
x = 5 - 6
x = -1