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  1. Home
  2. 12th grade
  3. Algebra I
  4. Exercise : Solve a linear inequality with graphs

Solve a linear inequality with graphs Algebra I

Solve the following linear inequalities using the given graph.

6-3x ≤ -12

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On the same graph, we draw the lines whose equations are:

\begin{cases} y=6-2x \cr \cr y=12 \end{cases}

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We can see on the graph that the lines intersect at \left(6,-12\right). The area in which the inequality holds is above the first line and below the second line (the green area).

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The set of solutions is [6,\infty).

2x-4 \le -2

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On the same graph, we draw the lines whose equations are:

\begin{cases} y=2x-4 \cr \cr y=-2\end{cases}

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We can see on the graph that the lines intersect at \left(1,-2\right). The area in which the inequality holds is above the first line and below the second line (the green area).

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The set of solutions is (-\infty,1].

4x-6 \le x

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On the same graph, we draw the lines whose equations are:

\begin{cases} y=4x-6 \cr \cr y=x \end{cases}

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We can see on the graph that the lines intersect at \left(2{,}2\right). The area in which the inequality holds is above the first line and below the second line (the green area).

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The set of solutions is (-\infty,2].

5x-24 \ge -x

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On the same graph, we draw the lines whose equations are:

\begin{cases} y=-x \cr \cr y=5x-24 \end{cases}

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We can see on the graph that the lines intersect at \left(4,-4\right). The area in which the inequality holds is above the first line and below the second line (the green area).

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The set of solutions is [4,\infty).

2x-3 \ge -1

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On the same graph, we draw the lines whose equations are:

\begin{cases} y=-1 \cr \cr y=2x-3 \end{cases}

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We can see on the graph that the lines intersect at \left(1,-1\right). The area in which the inequality holds is above the first line and below the second line (the green area).

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The set of solutions is [1,\infty).

1-4x \ge -3

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On the same graph, we draw the lines whose equations are:

\begin{cases} y=-3 \cr \cr y=1-4x \end{cases}

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We can see on the graph that the lines intersect at \left(1,-3\right). The area in which the inequality holds is above the first line and below the second line (the green area).

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The set of solutions is (-\infty,1].

3x-5 \ge 4

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On the same graph, we draw the lines whose equations are:

\begin{cases} y= 4 \cr \cr y=3x-5 \end{cases}

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We can see on the graph that the lines intersect at \left(3{,}4\right). The area in which the inequality holds is above the first line and below the second line (the green area).

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The set of solutions is [3,\infty).

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See also
  • Course : Linear inequalities
  • Exercise : Solve a linear inequality with simple operations
  • Exercise : Solve a system of linear inequalities
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