Sam bought a Blu-ray disc for $20.00 plus sales tax of 8%. What was the amount of tax paid?
2 answers:
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we will proceed to resolve each case to determine the solution
we have
we know that
If an ordered pair is the solution of the inequality, then it must satisfy the inequality.
<u>case a)</u>
Substitute the value of x and y in the inequality
-------> is true
so
The ordered pair is a solution
<u>case b)</u>
Substitute the value of x and y in the inequality
-------> is False
so
The ordered pair is not a solution
<u>case c)</u>
Substitute the value of x and y in the inequality
-------> is False
so
The ordered pair is not a solution
<u>case d)</u>
Substitute the value of x and y in the inequality
-------> is True
so
The ordered pair is a solution
<u>case e)</u>
Substitute the value of x and y in the inequality
-------> is False
so
The ordered pair is not a solution
Verify
using a graphing tool
see the attached figure
the solution is the shaded area below the line
The points A and D lies on the shaded area, therefore the ordered pairs A and D are solution of the inequality
