Math Answer of the Week
Let’s look at the solution to last week’s SAT Math problem:
If 9 > 4x + 1, which inequality represents the possible range of values of 12x + 3?
- 12x + 3 > 17
- 12x + 3 < 17
- 12x + 3 > 27
- 12x + 3 < 27
The correct answer is D.
While you can solve for x, then plug in the value to determine the expression for 12x + 3 (as shown below), there is a quicker solution! Multiplying 3 on both sides of the given equation is 3*(4x + 1) < 3*(9) = 12x + 3 < 27, which is D.
Note: C was the trick answer here–whichever order the inequality is written, 27 will still be the larger value.