a. y = x-4 y = 4x-10 b. x = 2y+7 3x-2y = 3 c. 4x-2y = 14 y = 1/2x-1 Selesaikan sistem persamaan berikut dengan menggunakan subsitusi!

a.
x - 4 = 4x - 10
x - 4x = -10 + 4
-3x = -6
x = 2

y = x - 4
y = 2 - 4
y = -2


b.
3(2y + 7) - 2y = 3
6y + 21 -2y = 3
6y - 2y = 3 - 21
4y = -18
y = -9/2

x = 2y + 7
x = 2(-9/2) + 7
x = -9 + 7
x = -2


c
4x - 2y = 14
4x - 2(½x - 1) = 14
4x - x - 2 = 14
3x = 14 + 2
3x = 16
x = 16/3

y = ½x - 1
y = ½(16/3) - 1
y = 8/3 - 3/3
y = 5/3

Maaf kalau benar ya kak...
Let's math every^DAMN^day!
[DAMNATION]™