exam Maths Puzzle Numerical Ability

Help me please I can not understand this. How do you graph f(x)=-x-2.PLEASE HELP Thank you in advance.

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exam Other Question

If ABC
+ DEF
= GHI

and
ADG
+BEH
=CFI

What numbers do you plug into this equation to make it correct both ways. IT says there are two answers. Ana is five years older than Beth.In 5 years, the product of their age is 1.5 times the product of their present ages. How old is Beth now?