Given the linear equation y = ax + b, for what values of x will y < 0?
(1) b = 3
(2) a < 0
1) y = ax + 3. y will be less than 0 for all ax < -3. Insufficent.
2) Clearly insufficient. Even if we assign one value to a(which itself is uncertain), x and b can still take several values. y = -x+b. Insufficient
1 & 2 together. y = ax + 3 and a is negative. x can take values of several +ve numbers whose range cannot be determined without knowing value of a. Insufficient. Answer is E.
Doubt if this is a 700 level question.
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