Chapter 3: Q.479 (page 358)
Determine whether each ordered pair is a solution to the inequality x + y > 4.
ⓐ (6, 1) ⓑ (−3, 6) ⓒ (3, 2) ⓓ (−5, 10) ⓔ (0, 0)
Short Answer
Ordered pairs (6, 1), (3, 2) and (-5, 10) are the solution of the given inequality.
But order pairs (-3, 6) and (0, 0) are not the solution of the given inequalities.
Step by step solution
Step 1. Given information
we have given inequality is x + y > 4 and ordered pair is (6, 1).
Step 2. Concept
The solution of a linear inequality in two variables, like Ax + By > C, is anordered pair (x, y) that produces a true statement when the values of x and y are substituted into the inequality.
Part (a) Step 1. Explanation
We have given inequality is,
x + y > 4
Now substituting the given ordered pairs, (6, 1)
Substituting 6 for x and 1 for y,
6 + 1 > 4
7 > 4
Yes the ordered pair (6, 1) is the solution of given inequality.
Part (a) Step 2. Conclusion
Hence, ordered pairs (6, 1) is the solution of the given inequality x + y > 4.
Part (b) Step 1. Explanation
We have given inequality is,
x + y > 4
Now substituting the given ordered pair
(-3, 6)
Substituting -3 for x and 6 for y,
-3 + 6 > 4
=> 3 > 4
We know that the 3 is less than 4 it means the ordered pair (-3, 6) is not the solution of the given inequality.
Part (b) Step 2. Conclusion
Hence, ordered pairs (-3, 6) is not the solution of the given inequality x + y > 4.
Part (c) Step 1. Explanation
We have given inequality is,
x + y > 4
Now substituting the given ordered pair
(3, 6),
Substituting 3 for x and 6 for y,
3 + 6 > 4
=> 9 > 4
We know that the 4 is less than 9 it means the ordered pair (3, 6) is the solution of the given inequality.
Part (c) Step 2. Conclusion
Hence, (3, 6) is the solution of the given inequality x + y > 4.
Part (d) Step 1. Explanation
We have given inequality is,
x + y > 4
Now substituting the given ordered pair
(-5, 10),
Substituting -5 for x and 10 for y,
-5 + 10 > 4
=> 5 > 4
So the order pair (-5, 10) is the solution of given inequality.
Part (d) Step 2. Conclusion
Hence, (-5, 10) is the solution of given inequality x + y > 4.
Part (e) Step 1. Explanation
We have given inequality is,
x + y > 4
Now substituting the given ordered pair,
(0, 0)
Substituting 0 for x and y,
0 + 0 > 4
=> 0 > 4
We know that the 0 is less than 4.
So ordered pair (0, 0) is not the solution of the given inequality.
Part (e) Step 2. Conclusion
Hence, (0, 0) is not the solution of the given inequality x + y > 4.
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