tentukan himpunan penyelesaian dari x+3y=10 2x-y=-1

x + 3y = 10 => 2x + 6y = 20 (dikali 2)
2x - y = -1
eliminasi, maka :
7y = 21
y = 21 / 7
y = 3

x + 3y = 10
x + 3(3) = 10
x + 9 = 10
x = 10 - 9
x = 1