jawab pertanyaan berikut menggunakan metode Subtitusi 1. 4x + 8y = 2 dan 6x - 8y = 13 2. 2(x+y) = 5 dan 4x - 3y + 18 = 0 jawab secepatnya ya, besok udah dikumpu

1. 4x+8y = 2
4x = -8y + 2
x = -2y + 1/2

subs. nilai x ke pers 2
6x-8y = 13
6(-2y+1/2)-8y = 13
-12y + 3 - 8y = 13
-20y = 10
y = -1/2

x = -2y + 1/2
x = -2(-1/2) + 1/2
x = 1 + 1/2
x = 3/2

2. 2(x+y) = 5
2x+2y = 5
2x = -2y + 5
x = -y + 5/2

subs. nila x ke pers 2
4x - 3y + 18 = 0
4(-y + 5/2) - 3y + 18 = 0
-4y + 10 - 3y + 18 = 0
-7y = -10 -18
y = -28/-7
y = 4

x = -y + 5/2
x = -4 + 5/2
x = -3/2