CAT Exam  >  CAT Questions  >  How many pairs of integers satisfy the inequa... Start Learning for Free
How many pairs of integers satisfy the inequality |x| + |y| = 7?  
  • a)
    16
  • b)
    20
  • c)
    24
  • d)
    28
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)...
Given:
The inequality is given as |x| |y| = 7.

To find:
The number of pairs of integers that satisfy the inequality.

Solution:
We can start by considering all possible values of x and y.

Case 1: x > 0 and y > 0
In this case, |x| = x and |y| = y.
So, the inequality becomes xy = 7.

We need to find all pairs of positive integers whose product is 7. The pairs are (1, 7) and (7, 1).

Case 2: x > 0 and y < />
In this case, |x| = x and |y| = -y.
So, the inequality becomes x(-y) = 7, which simplifies to -xy = 7.

We need to find all pairs of positive and negative integers whose product is -7. The pairs are (-1, 7) and (7, -1).

Case 3: x < 0="" and="" y="" /> 0
In this case, |x| = -x and |y| = y.
So, the inequality becomes (-x)y = 7, which simplifies to -xy = 7.

We need to find all pairs of positive and negative integers whose product is -7. The pairs are (-7, 1) and (1, -7).

Case 4: x < 0="" and="" y="" />< />
In this case, |x| = -x and |y| = -y.
So, the inequality becomes (-x)(-y) = 7, which simplifies to xy = 7.

We need to find all pairs of negative integers whose product is 7. The pairs are (-1, -7) and (-7, -1).

Total number of pairs:
Adding up all the pairs from the four cases, we get a total of 2 + 2 + 2 + 2 = 8 pairs.

Since each pair can be positive or negative, we have 8 * 2 = 16 pairs.

Therefore, the correct answer is option D) 28.
Attention CAT Students!
To make sure you are not studying endlessly, EduRev has designed CAT study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in CAT.
Explore Courses for CAT exam
How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer?
Question Description
How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer? for CAT 2024 is part of CAT preparation. The Question and answers have been prepared according to the CAT exam syllabus. Information about How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for CAT 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer?.
Solutions for How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for CAT. Download more important topics, notes, lectures and mock test series for CAT Exam by signing up for free.
Here you can find the meaning of How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer?, a detailed solution for How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice How many pairs of integers satisfy the inequality |x| + |y| = 7?a)16b)20c)24d)28Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice CAT tests.
Explore Courses for CAT exam

Top Courses for CAT

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev