Question

Tolong dibantu dengan caranya,Subtitusi MTK.Soalnya: x - y = 3 /\ x + 2 y = 0

Answer 1

X-y=3
x = 3+ y ------------ pers1
subsitusi pers 1 ke
x+2y =0
3+y +2y =0
3+3y =0
3y = -3
y= -3/3
y= -1
subsitu y = -1 ke pers1
x = 3+y
x = 3+(-1)
x = 2