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Maaf kalau salah..jawaban ada di file attachment

pake eliminasi dan subtitusi gan

nomor 63
2x - 3y = -17 | kali 3 | 6x - 9y = -51
3x + 2y = -6 | kali 2 | 6x + 4y = -12
----------------- kurang
-13y = 39
y = -3
subtitusikan
2x - 3y = -17 (terserah pake yg mana)
2x - 3(-3) = -17
2x -(-9) = -17
2x + 9 = -17
2x = -17 - 9
2x = -8
x = -4

x + y = (-4) + (-3)
= -7
jawaban A


nomor 64
7x + 2y = 19| kali 4| 28x + 8y = 76
4x - 3y = 15| kali 7| 28x - 21y = 105
------------------ kurang
29 y = -29
y = - 1
subtitusi
7x + 2y = 19
7x + 2(-1) = 19
7x - 2 = 19
7x = 19 + 2
7x = 21
x = 3

3x - 2y = 3(3) - 2(-1)
= 9 + 2
= 11
Jawaban D

Maaf jika ada yg salah :)