Jika garis x-4y = 12, 2x-y=10, dan ax+3y = 2 berpotongan disatu titik, nilai a=..

x - 4y = 12 |kali 2|
2x - y = 10
______________ -
- 7y = 14
y = - 2
x = 4
ax + 3y = 2
masukan titik (4,-2)
4a - 6 = 2
4a = 8
a = 2