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2p = q+7
2p-q = 7 ...pers 1
Log (8p+5q) = 1
= log 10
8p+5q = 10 ..pers 2
pers 1 : 2p - q = 7 x5 10p-5q = 35
pers 2 : 8p+5q = 10 x1 8p+5q = 10
----------------- +
18p = 45
p = 45/18
= 5/2
2(5/2)-q = 7
5 -q = 7
q = -2
p-q = 5/2 - (-2)
= 5/2 + 2
= 2 1/2 + 2
= 4 1/2
dst. sila posting soal yg lain. maximal 2 soal per posting