Update a field based on supplied variable

I have a table called:
Rebate_Qualifier
3 fields:
Rebate_ID      Entity_Value      Qualifier_ID

"Entity_Value" will always have a value in the field.

I have 2 variables    rb   and   ent

rb = SLS-000118-MAIN-A1-5-R1
ent = 5

The Rebate_Id is null
Qualifier_ID is null

Table example below:

Rebate_ID	Entity_Value	Qualifier_ID
	                AABAA	
	                AABAA	
	                AABAA	
	                AABAA	

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What I need:
I need to update the Rebate_Id field with  variable  rb
I need to update the Qualifier_ID field with  variable  ent


Thanks
fordraiders