ubahlah ke metode gabungan x=2y-3 dan y=2x+1

jawab
persmaan linier

x =  2y - 3 .....(i)
y = 2x + 1.....(ii)


(i) sub ke (ii)
y = 2(2y - 3) + 1
y = 4y - 6 + 1
y = 4y - 5
y- 4y = - 5
- 3y = - 5
y = 5/3

x = 2y - 3
x = 2(5/3) - 3
x= 10/3 - 3
x = 1/3