Determine If an Ordered Pair Is a Solution to a System of Inequalities

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Determine which ordered pairs are solutions to the given system.

2x−3y≤9
2x−y≥−1

i. (1,−2)
ii. (−1,2)
iii. (3,−1)

Systems of Linear Inequalities in Two Variables

A system of inequalities in two variables is the collection of two or more inequalities in two variables considered together. If all inequalities are linear, then the system is a system of linear inequalities in two variables. If at least one inequality is nonlinear, then the system is a system of nonlinear inequalities in two variables.
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What if the ordered point has a fraction in it like ( 1/2, 2) I really don't know pls help me :‹‹

aileen