2.
Linear Inequalities
• Look like the equation of a line, but
have , , , or instead of =.
• Solutions are ordered pairs (x, y) that
make the inequality true.
3.
Checking Solutions
• Is (0, 1) a solution of 2x + 3y 5 ?
4.
You Try!
• Is (4, -1) a solution of 2x + 3y 5 ?
• Is (-3, 2) ?
5.
Graphing Linear Inequalities
•Pretend the inequality is an = sign.
•Graph the line like normal except:
▫ < and > use dashed line
▫ and use solid line
•Pick a point and plug it in to decide
where to shade.
•Shade the side that is TRUE!
13.
Writing Inequalities from Graphs
1. Write the equation of the line.
Use y = mx + b if possible.
2. Choose a point (x, y) from the
shaded area and plug it in.
3. Replace = sign with an inequality
that makes the statement true.
4. For dashed lines choose < or >,
for solid lines choose or .
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