Question

Diketahui SPL
3x – ay = 1
ax – by = 8
Mempunyai himpunan penyelesaian {( 2,5)} ,maka tentukan nilai a + b

Answer 1

3(2) - a(5) = 1
6 - 5a = 1
7 = 5a
a = 7/5
(7/5)(2) - b(5) = 8
14/5 - 5b = 8
14/5 -8 = 5b
-26/5 = 5b
b = -26/25
a+b
= (7/5)+(-26/25)
=(35-26)/25
=9/25