Diketahui 4x-3y=-18 Dan 5x+2y= -11 Tentukan nilai dari x + 4y ? Mencari x

Gunakan METODE eliminasi

4x - 3y = -18 | x 2
5x+2y= -11 | x 3
---------------
8x - 6y = -36
15x + 6y = - 33
............................ +
23x = -69
x = -69/23
x = -3

Maka, Nilai y adalah :

4x + 3y = - 18
4(-3) + 3y = - 18
-12 + 3y = - 18
3y = -18 + 12
3y = -6
y = -6/3
y = -2

Maka, Nilai x + 4y
= 3 + 4(-2)
= 3 - 8
= -5

4x - 3y = -18
5x + 2y = -11

Caranya :
4x - 3y = -18 >> × 2
5x + 2y = -11 >> × 3

8x - 6y = -36
15x +6y = -33
.............................. +
23x = -69
x = -69/23
x = -3

Untuk mencari y
8x - 6y = 36
8 (-3) - 6y = 36
-24 - 6y = 36
-6y = 36 + 24
-6y = 60
y = 60/-6
y = -10

x = -3
y = -10

Nilai dari x + 4y
= -3 + 4 (-10)
= -3 - 40
= -43

Jadi, nilai × + 4y = -43

Smoga membantu :) ^ ^