Hp dari sistem persmaan ax + by = 5 dan 5x + ay = 8 adalah {(1,2)} nilai a dan b berturut turut?? pakai cara

(x,y) = (1,2)
ax + by = 5
a(1) + b(2) = 5
a + 2b = 5.....(i)

5x + ay = 8
5(1) + a(2) = 8
5 + 2a = 8
2a = 3
a = 3/2

dari (i) a + 2b = 5
3/2 + 2b = 5
2b  = 7/2
b  = 7/4

SPLDV

ax + by = 5
5x + ay = 8

Solusi = (1,2)

5.1 + a.2 = 8
2a = 8 - 5
a = 3/2 ✔

ax + by = 5
3/2 . 1 + b.2 = 5
2b = 5 - 3/2
2b = 7/2
b = 7/4 ✔