this is equivalent to:
[tex]z\text{ + 7 - 7 }\leq9\text{ -7}[/tex]this is equivalent to
[tex]z\text{ + 0 }\leq9\text{ -7 }[/tex]this is equivalent to
[tex]z\text{ }\leq2[/tex]so the interval that represents the last inequality is :
[tex](-\infty,\text{ 2}\rbrack[/tex]graphically this interval is represented by:
