Question

Tolong bantuin ngerjain PR nya donkk, no 5 sma no 8 doankk

Answer 1

Nomor 5.
x = y + 2
y = 2x - 5
Subsyitusikan, didapat:
x = 2x - 5 + 2
x = 2x - 3
2x - x = 3
x = 3
Lalu.
y = 2x - 5
y = 2(3) - 5 = 6 - 5
y = 1
Sehingga, x = 3 dan y = 1

Nomor 8.
2x + y + 5 = 2
2x + y = -3
y = -2x - 3
Lalu,
3y + 2x = -5
Substitusikan,
3(-2x-3) + 2x = -5
-6x - 9 + 2x = -5
-4x = -5 + 9
-4x = 4
x = -1
Dan,
y = -2x-3
y = -2(-1) - 3 = 2 - 3
y = -1
Sehingga,
x = -1 dan y = -1