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2x-5y = -53. x5. 10x-25y = -265
-------------------------- –
21y = 267
y = 12,7 = 13
5x-4y = 2
5x-4(13) = 2
5x = 2 +52
5x = 54
x = 15,1 = 15
7x-3y = 7.15 - 3.13
= 105 - 39
= 66
2x - 5y =-53 (x4)
25x - 20y = 10
8x - 20y = -212
---------------------- -
17x = 222
x = 13.05
subtitusi ke pernyataan
5(13.05) - 4y = 2
65.29 - 4y = 2
- 4y = 2- 65.29
-4y = -63.29
y = 15.82
maka 7x -3y = ?
7(13.05) - 3(15.82) = 91.35 - 47.46 = 43.89