Question

Tolong kerjain ya pakai cara metode eliminasi

Answer 1

X = buku
y = pensil

10x + 2y = 16.200 (×2) = 20x + 4y = 32.400
5x + 4y = 9.900 (×1) => 5x + 4y = 9.900

20x + 4y = 32.400
5x + 4y = 9.900
------------------------ +
25x = 42.300
x = 42.300/25
x = 1.692

subsitusikan
x = 1.692 => 5x + 4y = 9.900
(5×1.692) + 4y = 9.900
8.460 + 4y = 9.900
4y = 9.900 - 8.460
4y = 1.440
y = 1.440/4
y = 360
jawab:
1 buku = Rp. 1.692
1 pensil = Rp. 360