Question

Agar sistem persamaan
3x - 2y = 11
7x - 2y = 31
ax - 6y = 13
mempunyai penyelesaian , mk nilai 4a+6 adalah?

Answer 1

3x - 2y = 11
7x - 2y = 31
kurangkan
4x = 20 --> .x = 5
3x - 2y = 11
15 - 2y = 11
-2y = 11 -15 = - 4
y = 2

ax -6y = 13
a(5) - 6(2) = 13
5a= 13+12 = 25
a = 5

Nilai 4a + 6 = 4(5) + 6 = 20 + 6 = 26