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Verified answer
Jawab2x - y = 1
4x -y = 5 ...(-)
-2x = -4
x = 2
2x - y = 1
4 - y = 1
y = 3
ax - 7 -y= 0
a(2) - 7 - 3 = 0
2a - 10 = 0
a = 5