• Example 1
• Example 2
• Example 3
• Example 4

Notice the graph has an open circle and is shaded to the right.
This means that any number to the right of (but not including) −16 will make this inequality true.

How do you know if this is correct?

This graph has a solid circle and is shaded to the right.  This means any number to the right of (and including) −4 will make this inequality true!

What if you had forgotten to flip the symbol? Would it really affect the answer?

Therefore, any number to the left of –3 will make this inequality true.

Number of T-shirts
Total Cost (in dollars)
x ≤  200
C = 55 + 2.40x
x > 200
C = 55 + 2.40x - 0.24x

A garment store takes orders for printing company logos on T-shirts. The store charges a fixed handling charge of \$55 and an additional charge of \$2.40 to print each T-shirt. The store offers a discount of 10% on the printing fee alone if an order contains more than 200 T-shirts. The equations above can be used to determine the total cost in dollars, C, to print x number of T-shirts.