Answer:
ax + y = (21, -16, 29)
Explanation:
ax + y = [(-6a + 3), (3a - 7), (-8a + 5)]
now,
-8a + 5 = 29
a = (29 - 5)/-8
a = -3
ax + y = [(-6)(-3)+3, 3(-3)-7, 29]
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