If you rearrange the equation you get 0 = 3x + 2 - y.
1) One of the two expressions must equal 0 for the product of the two expression to equal 0. However, we cannot be sure if it is the first one, which matches the equation above, or the second. INSUFFICIENT
2) One of the two expressions must equal 0 for the product of the two expression to equal 0. However, we cannot be sure if it is the second one, which matches the equation above, or the first. INSUFFICIENT
Putting them together we know that it must be the expression that matches the equation. There is no way for 4r - 6 - s and 4r + 9 - s to both equal zero. You will notice that 4r - s is in both expressions and one is increased by 9 and the other decreased by 6.
The answer is C.
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