<u>Part 1)</u>
In this problem we have two lines
<u>The equation of the fist line is</u>
The solution is the shaded area above the dashed line
so
the inequality is
<u>The equation of the second line is</u>
The solution is the shaded area below the full line
so
the inequality is
therefore
<u>the answer Part 1) is</u>
and
<u>Part 2)</u>
In this problem we have two lines
<u>The equation of the fist line is</u>
The solution is the shaded area above the full line
so
the inequality is
<u>The equation of the second line is</u>
The solution is the shaded area below the full line
so
the inequality is
therefore
the answer Part 2) is
and
<u>Part 3)</u>
In this problem we have only one line
<u>The equation of the line is</u>
The solution is the shaded area above the dashed line
so
the inequality is
therefore
<u>the answer Part 3) is</u>
<u>Part 4)</u>
we know that
the solution of the system of linear equations is the intersection both graphs
so
see the graph
the solution point is
therefore
<u>the answer part 4) is the option</u>