kak please bantu aku kak
Jawaban:
5x + 3y = 12 ........×2
2x - 5y = 11...........×5
----------------------
10x + 6y = 24
10x - 25y = 55
-------------------------(-)
31y = -31
y = -1
5x + 3y = 12
5x + 3(-1) = 12
5x = 12 +3
x = 15/5
x = 3
jadi 7x -3y = 7(3) -3(-1)
= 21 +3
=24
jawabnya = C
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