Answer:
3a + b = 7
6x + 8y = 40
9a + 3b is 3*(3a + b) or 7*3 = 21
3x + 4y is (6x + 8y) /3 = 40 / 3 ≅ 13.3
So now we know that 9a + 3b = 21 and 3x + 4y = 13.3 which means that it is greater because 21 > 13.3
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