Question

Tentukan penyelesaian dari sistem persamaaan
A. 5x -y + 21 =0 dan 3x - 2y = -21

Answer 1

Verified answer

5x-y+21 = 0 → 5x-y = -21
3x-2y = -21

jawab :
>> Eliminasi <<
10x-2y = -42
3x-2y = -21
__________ -
7x = -21
x = -3

>> Substitusi <<
3x-2y = -21
3(-3)-2y = -21
-9-2y = -21
-2y = -21 + 9
y = -12/-2
y = 6

Hp = {-3,6}

semoga membantu... .