Problem Solving

BTGModeratorVI wrote: ↑

Fri Apr 03, 2020 9:29 am

Which of the following points falls outside of the region defined by 2y ≤ 6x − 12?

A. (5, 1)
B. (3, -8)
C. (2, 0)
D. (1, -2)
E. (0, -14)

Answer: D
Source: Veritas Prep

One option is to sketch the region and check each point, but TESTING THE ANSWER CHOICES might be faster.

NOTE: this is one of those questions that require us to check/test each answer choice. In these situations, always check the answer choices from E to A, because the correct answer is typically closer to the bottom than to the top.

For more on this strategy, see my article: https://www.gmatprepnow.com/articles/han ... -questions

E. (0, -14)
Plug in x and y values to get: 2(-14) ≤ 6(0) − 12
Simplify: -28 ≤ -12
This satisfies the inequality, which means the point lies INSIDE the region.
ELIMINATE E

D. (1, -2)
Plug in x and y values to get: 2(1) ≤ 6(-2) − 12
Simplify: 2 ≤ -24
This DOES NOT satisfy the inequality, which means the point lies OUTSIDE the region.

Answer: D

Cheers,
Brent

BTGModeratorVI wrote: ↑

Fri Apr 03, 2020 9:29 am

Which of the following points falls outside of the region defined by 2y ≤ 6x − 12?

A. (5, 1)
B. (3, -8)
C. (2, 0)
D. (1, -2)
E. (0, -14)

Answer: D
Source: Veritas Prep

If a point falls outside of the region defined by 2y ≤ 6x − 12, its coordinates will NOT satisfy the inequality. So let’s check each given choice until we find the correct answer.

A. (5, 1)

2(1) ≤ 6(5) − 12 ?

2 ≤ 18 ? → Yes

B. (3, -8)

2(-8) ≤ 6(3) − 12 ?

-16 ≤ 6 ? → Yes

C. (2, 0)

2(0) ≤ 6(2) − 12 ?

0 ≤ 0 ? → Yes

D. (1, -2)

2(-2) ≤ 6(1) − 12 ?

-4 ≤ -6 ? → No

Answer: D