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2^x-1 - 2^y = -3
-> 2x+2+y=20
●2x+y= 18
-> x-1-y= -3
●x-y= -2
(lalu eliminasi yg dikasih tanda ●)
ntar ditemukan x=1 , y=4
maka (x+y)= 5
- = - 3
--------------------------------------- +
+ = 17
+ = 17
+ = 17 ...kalikan dengan 2
+ = 34
2³ . + = 34
8. + - 34 = 0
( - 2) (8. + 17) = 0
- 2 = 0 atau 8. + 17 = 0
= 2 atau 8. = - 17 (tak memenuhi)
x = 1
+ = 20
+ = 20
4² + = 20
16 + = 20
= 20 - 16
= 4
y = 2
x + y = 1 + 2
= 3