Himpunan penyelesaian sistem persamaan 4x+ 7y = 5 dan x + y = -1 adalah … .
Jawaban:
4x + 7y = 5
x + y = -1
x = -1 – y
4(-1 – y) + 7y = 5
-4 – 4y + 7y = 5
3y = 9
y = 3
x = -1 – 3 = -4
Hp = (-4 , 3)
Himpunan penyelesaian sistem persamaan 4x+ 7y = 5 dan x + y = -1 adalah … .
Jawaban:
4x + 7y = 5
x + y = -1
x = -1 – y
4(-1 – y) + 7y = 5
-4 – 4y + 7y = 5
3y = 9
y = 3
x = -1 – 3 = -4
Hp = (-4 , 3)