Question

Diketahui sistem persamaan 2×-5y+8=0 dan 3×+y-5=0 Nilai ×+2y adalah...

Answer 1

2x - 5y + 8 = 0 | dikali 1 | 2x - 5y + 8 = 0
3x + y - 5 = 0 | dikali 5 | 15x + 5y - 25 = 0
____________ +
17x - 17 = 0
17x = 17
x = 1
3x + y - 5 = 0
3.(1) + y - 5 = 0
3 + y - 5 = 0
y = 0 - 3 + 5
y = 2

x + 2y = 1 + 2. (2)
= 1 + 4
= 5