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a.
R - S = 5000
4R + 3S = 90000
b.
Persamaan 1 kalikan 3
3R - 3S = 15000
4R + 3S = 90000
Jumlahkan,
7R = 105000
R = 15000
R-S = 5000
15000 - S = 5000
S = 15000-5000
S = 10000
R = 15000, S = 10000
c.
R+S = 15000+10000
R+S = 25000