Question

X + y = 12 dan 3x - y = 4

Answer 1

X + y = 12 x=12-y.... (1)
3x - y = 4......................(2)

substitusi kan pers. (1) ke pers. (2)

3x - y = 4
3(12-y) -y =4
36-3y-y=4
36-4y=4
-4y=4-36
-4y=-32
y=8

y=8,Substitusi ke pers. (1)
x=12-y
x=12-8
x=4

HP= {4,8}